def test_has():
assert cot(x).has(x)
assert cot(x).has(cot)
assert not cot(x).has(sin)
assert sin(x).has(x)
assert sin(x).has(sin)
assert not sin(x).has(cot)
def trig_rule(integral):
integrand, symbol = integral
if isinstance(integrand, sympy.sin) or isinstance(integrand, sympy.cos):
arg = integrand.args[0]
if not isinstance(arg, sympy.Symbol):
return # perhaps a substitution can deal with it
if isinstance(integrand, sympy.sin):
func = 'sin'
else:
func = 'cos'
return TrigRule(func, arg, integrand, symbol)
if isinstance(integrand, sympy.tan):
rewritten = sympy.sin(*integrand.args) / sympy.cos(*integrand.args)
elif isinstance(integrand, sympy.cot):
rewritten = sympy.cos(*integrand.args) / sympy.sin(*integrand.args)
elif isinstance(integrand, sympy.sec):
arg = integrand.args[0]
rewritten = ((sympy.sec(arg)**2 + sympy.tan(arg) * sympy.sec(arg)) /
(sympy.sec(arg) + sympy.tan(arg)))
elif isinstance(integrand, sympy.csc):
arg = integrand.args[0]
rewritten = ((sympy.csc(arg)**2 + sympy.cot(arg) * sympy.csc(arg)) /
(sympy.csc(arg) + sympy.cot(arg)))
return RewriteRule(
rewritten,
integral_steps(rewritten, symbol),
integrand, symbol
)
def test_periodicity():
x = Symbol('x')
y = Symbol('y')
assert periodicity(sin(2*x), x) == pi
assert periodicity((-2)*tan(4*x), x) == pi/4
assert periodicity(sin(x)**2, x) == 2*pi
assert periodicity(3**tan(3*x), x) == pi/3
assert periodicity(tan(x)*cos(x), x) == 2*pi
assert periodicity(sin(x)**(tan(x)), x) == 2*pi
assert periodicity(tan(x)*sec(x), x) == 2*pi
assert periodicity(sin(2*x)*cos(2*x) - y, x) == pi/2
assert periodicity(tan(x) + cot(x), x) == pi
assert periodicity(sin(x) - cos(2*x), x) == 2*pi
assert periodicity(sin(x) - 1, x) == 2*pi
assert periodicity(sin(4*x) + sin(x)*cos(x), x) == pi
assert periodicity(exp(sin(x)), x) == 2*pi
assert periodicity(log(cot(2*x)) - sin(cos(2*x)), x) == pi
assert periodicity(sin(2*x)*exp(tan(x) - csc(2*x)), x) == pi
assert periodicity(cos(sec(x) - csc(2*x)), x) == 2*pi
assert periodicity(tan(sin(2*x)), x) == pi
assert periodicity(2*tan(x)**2, x) == pi
assert periodicity(sin(x)**2 + cos(x)**2, x) == S.Zero
assert periodicity(tan(x), y) == S.Zero
assert periodicity(exp(x), x) is None
assert periodicity(log(x), x) is None
assert periodicity(exp(x)**sin(x), x) is None
assert periodicity(sin(x)**y, y) is None
def test_tan_rewrite():
neg_exp, pos_exp = exp(-x*I), exp(x*I)
assert tan(x).rewrite(exp) == I*(neg_exp - pos_exp)/(neg_exp + pos_exp)
assert tan(x).rewrite(sin) == 2*sin(x)**2/sin(2*x)
assert tan(x).rewrite(cos) == -cos(x + S.Pi/2)/cos(x)
assert tan(x).rewrite(cot) == 1/cot(x)
assert tan(sinh(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, sinh(3)).n()
assert tan(cosh(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, cosh(3)).n()
assert tan(tanh(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, tanh(3)).n()
assert tan(coth(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, coth(3)).n()
assert tan(sin(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, sin(3)).n()
assert tan(cos(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, cos(3)).n()
assert tan(tan(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, tan(3)).n()
assert tan(cot(x)).rewrite(
exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, cot(3)).n()
assert tan(log(x)).rewrite(Pow) == I*(x**-I - x**I)/(x**-I + x**I)
assert 0 == (cos(pi/15)*tan(pi/15) - sin(pi/15)).rewrite(pow)
assert tan(pi/19).rewrite(pow) == tan(pi/19)
assert tan(8*pi/19).rewrite(sqrt) == tan(8*pi/19)
def test_trigsimp1():
x, y = symbols('x,y')
assert trigsimp(1 - sin(x)**2) == cos(x)**2
assert trigsimp(1 - cos(x)**2) == sin(x)**2
assert trigsimp(sin(x)**2 + cos(x)**2) == 1
assert trigsimp(1 + tan(x)**2) == 1/cos(x)**2
assert trigsimp(1/cos(x)**2 - 1) == tan(x)**2
assert trigsimp(1/cos(x)**2 - tan(x)**2) == 1
assert trigsimp(1 + cot(x)**2) == 1/sin(x)**2
assert trigsimp(1/sin(x)**2 - 1) == cot(x)**2
assert trigsimp(1/sin(x)**2 - cot(x)**2) == 1
assert trigsimp(5*cos(x)**2 + 5*sin(x)**2) == 5
assert trigsimp(5*cos(x/2)**2 + 2*sin(x/2)**2) in \
[2 + 3*cos(x/2)**2, 5 - 3*sin(x/2)**2]
assert trigsimp(sin(x)/cos(x)) == tan(x)
assert trigsimp(2*tan(x)*cos(x)) == 2*sin(x)
assert trigsimp(cot(x)**3*sin(x)**3) == cos(x)**3
assert trigsimp(y*tan(x)**2/sin(x)**2) == y/cos(x)**2
assert trigsimp(cot(x)/cos(x)) == 1/sin(x)
assert trigsimp(cos(0.12345)**2 + sin(0.12345)**2) == 1
e = 2*sin(x)**2 + 2*cos(x)**2
assert trigsimp(log(e), deep=True) == log(2)
def test_trigsimp_noncommutative():
x, y = symbols('x,y')
A, B = symbols('A,B', commutative=False)
assert trigsimp(A - A*sin(x)**2) == A*cos(x)**2
assert trigsimp(A - A*cos(x)**2) == A*sin(x)**2
assert trigsimp(A*sin(x)**2 + A*cos(x)**2) == A
assert trigsimp(A + A*tan(x)**2) == A/cos(x)**2
assert trigsimp(A/cos(x)**2 - A) == A*tan(x)**2
assert trigsimp(A/cos(x)**2 - A*tan(x)**2) == A
assert trigsimp(A + A*cot(x)**2) == A/sin(x)**2
assert trigsimp(A/sin(x)**2 - A) == A/tan(x)**2
assert trigsimp(A/sin(x)**2 - A*cot(x)**2) == A
assert trigsimp(y*A*cos(x)**2 + y*A*sin(x)**2) == y*A
assert trigsimp(A*sin(x)/cos(x)) == A*tan(x)
assert trigsimp(A*tan(x)*cos(x)) == A*sin(x)
assert trigsimp(A*cot(x)**3*sin(x)**3) == A*cos(x)**3
assert trigsimp(y*A*tan(x)**2/sin(x)**2) == y*A/cos(x)**2
assert trigsimp(A*cot(x)/cos(x)) == A/sin(x)
assert trigsimp(A*sin(x + y) + A*sin(x - y)) == 2*A*sin(x)*cos(y)
assert trigsimp(A*sin(x + y) - A*sin(x - y)) == 2*A*sin(y)*cos(x)
assert trigsimp(A*cos(x + y) + A*cos(x - y)) == 2*A*cos(x)*cos(y)
assert trigsimp(A*cos(x + y) - A*cos(x - y)) == -2*A*sin(x)*sin(y)
assert trigsimp(A*sinh(x + y) + A*sinh(x - y)) == 2*A*sinh(x)*cosh(y)
assert trigsimp(A*sinh(x + y) - A*sinh(x - y)) == 2*A*sinh(y)*cosh(x)
assert trigsimp(A*cosh(x + y) + A*cosh(x - y)) == 2*A*cosh(x)*cosh(y)
assert trigsimp(A*cosh(x + y) - A*cosh(x - y)) == 2*A*sinh(x)*sinh(y)
assert trigsimp(A*cos(0.12345)**2 + A*sin(0.12345)**2) == 1.0*A
def test_cot_rewrite():
x = Symbol('x')
neg_exp, pos_exp = exp(-x*I), exp(x*I)
assert cot(x).rewrite(exp) == I*(pos_exp+neg_exp)/(pos_exp-neg_exp)
assert cot(x).rewrite(sin) == 2*sin(2*x)/sin(x)**2
assert cot(x).rewrite(cos) == -cos(x)/cos(x + S.Pi/2)
assert cot(x).rewrite(tan) == 1/tan(x)
def test_trigonometric():
x = Symbol('x')
n3 = Rational(3)
e = (sin(x)**2).diff(x)
assert e == 2*sin(x)*cos(x)
e = e.subs(x, n3)
assert e == 2*cos(n3)*sin(n3)
e = (sin(x)**2).diff(x)
assert e == 2*sin(x)*cos(x)
e = e.subs(sin(x), cos(x))
assert e == 2*cos(x)**2
assert exp(pi).subs(exp, sin) == 0
assert cos(exp(pi)).subs(exp, sin) == 1
i = Symbol('i', integer=True)
zoo = S.ComplexInfinity
assert tan(x).subs(x, pi/2) is zoo
assert cot(x).subs(x, pi) is zoo
assert cot(i*x).subs(x, pi) is zoo
assert tan(i*x).subs(x, pi/2) == tan(i*pi/2)
assert tan(i*x).subs(x, pi/2).subs(i, 1) is zoo
o = Symbol('o', odd=True)
assert tan(o*x).subs(x, pi/2) == tan(o*pi/2)
def test_hyper_as_trig():
from sympy.simplify.fu import _osborne as o, _osbornei as i, TR12
eq = sinh(x)**2 + cosh(x)**2
t, f = hyper_as_trig(eq)
assert f(fu(t)) == cosh(2*x)
e, f = hyper_as_trig(tanh(x + y))
assert f(TR12(e)) == (tanh(x) + tanh(y))/(tanh(x)*tanh(y) + 1)
d = Dummy()
assert o(sinh(x), d) == I*sin(x*d)
assert o(tanh(x), d) == I*tan(x*d)
assert o(coth(x), d) == cot(x*d)/I
assert o(cosh(x), d) == cos(x*d)
for func in (sinh, cosh, tanh, coth):
h = func(pi)
assert i(o(h, d), d) == h
# /!\ the _osborne functions are not meant to work
# in the o(i(trig, d), d) direction so we just check
# that they work as they are supposed to work
assert i(cos(x*y), y) == cosh(x)
assert i(sin(x*y), y) == sinh(x)/I
assert i(tan(x*y), y) == tanh(x)/I
assert i(cot(x*y), y) == coth(x)*I
assert i(sec(x*y), y) == 1/cosh(x)
assert i(csc(x*y), y) == I/sinh(x)
def test_cot_series():
assert cot(x).series(x, 0, 9) == \
1/x - x/3 - x**3/45 - 2*x**5/945 - x**7/4725 + O(x**9)
# issue 6210:
assert cot(x**20 + x**21 + x**22).series(x, 0, 4) == \
x**(-20) - 1/x**19 + x**(-17) - 1/x**16 + x**(-14) - 1/x**13 + \
x**(-11) - 1/x**10 + x**(-8) - 1/x**7 + x**(-5) - 1/x**4 + \
x**(-2) - 1/x + x - x**2 + O(x**4)
def test_basic1():
assert limit(x, x, oo) == oo
assert limit(x, x, -oo) == -oo
assert limit(-x, x, oo) == -oo
assert limit(x**2, x, -oo) == oo
assert limit(-x**2, x, oo) == -oo
assert limit(x*log(x), x, 0, dir="+") == 0
assert limit(1/x, x, oo) == 0
assert limit(exp(x), x, oo) == oo
assert limit(-exp(x), x, oo) == -oo
assert limit(exp(x)/x, x, oo) == oo
assert limit(1/x - exp(-x), x, oo) == 0
assert limit(x + 1/x, x, oo) == oo
assert limit(x - x**2, x, oo) == -oo
assert limit((1 + x)**(1 + sqrt(2)), x, 0) == 1
assert limit((1 + x)**oo, x, 0) == oo
assert limit((1 + x)**oo, x, 0, dir='-') == 0
assert limit((1 + x + y)**oo, x, 0, dir='-') == (1 + y)**(oo)
assert limit(y/x/log(x), x, 0) == -oo*sign(y)
assert limit(cos(x + y)/x, x, 0) == sign(cos(y))*oo
assert limit(gamma(1/x + 3), x, oo) == 2
assert limit(S.NaN, x, -oo) == S.NaN
assert limit(Order(2)*x, x, S.NaN) == S.NaN
assert limit(1/(x - 1), x, 1, dir="+") == oo
assert limit(1/(x - 1), x, 1, dir="-") == -oo
assert limit(1/(5 - x)**3, x, 5, dir="+") == -oo
assert limit(1/(5 - x)**3, x, 5, dir="-") == oo
assert limit(1/sin(x), x, pi, dir="+") == -oo
assert limit(1/sin(x), x, pi, dir="-") == oo
assert limit(1/cos(x), x, pi/2, dir="+") == -oo
assert limit(1/cos(x), x, pi/2, dir="-") == oo
assert limit(1/tan(x**3), x, (2*pi)**(S(1)/3), dir="+") == oo
assert limit(1/tan(x**3), x, (2*pi)**(S(1)/3), dir="-") == -oo
assert limit(1/cot(x)**3, x, (3*pi/2), dir="+") == -oo
assert limit(1/cot(x)**3, x, (3*pi/2), dir="-") == oo
# test bi-directional limits
assert limit(sin(x)/x, x, 0, dir="+-") == 1
assert limit(x**2, x, 0, dir="+-") == 0
assert limit(1/x**2, x, 0, dir="+-") == oo
# test failing bi-directional limits
raises(ValueError, lambda: limit(1/x, x, 0, dir="+-"))
# approaching 0
# from dir="+"
assert limit(1 + 1/x, x, 0) == oo
# from dir='-'
# Add
assert limit(1 + 1/x, x, 0, dir='-') == -oo
# Pow
assert limit(x**(-2), x, 0, dir='-') == oo
assert limit(x**(-3), x, 0, dir='-') == -oo
assert limit(1/sqrt(x), x, 0, dir='-') == (-oo)*I
assert limit(x**2, x, 0, dir='-') == 0
assert limit(sqrt(x), x, 0, dir='-') == 0
assert limit(x**-pi, x, 0, dir='-') == oo*sign((-1)**(-pi))
assert limit((1 + cos(x))**oo, x, 0) == oo
def test_basic1():
assert limit(x, x, oo) == oo
assert limit(x, x, -oo) == -oo
assert limit(-x, x, oo) == -oo
assert limit(x**2, x, -oo) == oo
assert limit(-x**2, x, oo) == -oo
assert limit(x*log(x), x, 0, dir="+") == 0
assert limit(1/x, x, oo) == 0
assert limit(exp(x), x, oo) == oo
assert limit(-exp(x), x, oo) == -oo
assert limit(exp(x)/x, x, oo) == oo
assert limit(1/x - exp(-x), x, oo) == 0
assert limit(x + 1/x, x, oo) == oo
assert limit(x - x**2, x, oo) == -oo
assert limit((1 + x)**(1 + sqrt(2)), x, 0) == 1
assert limit((1 + x)**oo, x, 0) == oo
assert limit((1 + x)**oo, x, 0, dir='-') == 0
assert limit((1 + x + y)**oo, x, 0, dir='-') == (1 + y)**(oo)
assert limit(y/x/log(x), x, 0) == -y*oo
assert limit(cos(x + y)/x, x, 0) == sign(cos(y))*oo
raises(NotImplementedError, lambda: limit(Sum(1/x, (x, 1, y)) -
log(y), y, oo))
assert limit(Sum(1/x, (x, 1, y)) - 1/y, y, oo) == Sum(1/x, (x, 1, oo))
assert limit(gamma(1/x + 3), x, oo) == 2
assert limit(S.NaN, x, -oo) == S.NaN
assert limit(Order(2)*x, x, S.NaN) == S.NaN
assert limit(Sum(1/x, (x, 1, y)) - 1/y, y, oo) == Sum(1/x, (x, 1, oo))
assert limit(gamma(1/x + 3), x, oo) == 2
assert limit(S.NaN, x, -oo) == S.NaN
assert limit(Order(2)*x, x, S.NaN) == S.NaN
assert limit(1/(x - 1), x, 1, dir="+") == oo
assert limit(1/(x - 1), x, 1, dir="-") == -oo
assert limit(1/(5 - x)**3, x, 5, dir="+") == -oo
assert limit(1/(5 - x)**3, x, 5, dir="-") == oo
assert limit(1/sin(x), x, pi, dir="+") == -oo
assert limit(1/sin(x), x, pi, dir="-") == oo
assert limit(1/cos(x), x, pi/2, dir="+") == -oo
assert limit(1/cos(x), x, pi/2, dir="-") == oo
assert limit(1/tan(x**3), x, (2*pi)**(S(1)/3), dir="+") == oo
assert limit(1/tan(x**3), x, (2*pi)**(S(1)/3), dir="-") == -oo
assert limit(1/cot(x)**3, x, (3*pi/2), dir="+") == -oo
assert limit(1/cot(x)**3, x, (3*pi/2), dir="-") == oo
# approaching 0
# from dir="+"
assert limit(1 + 1/x, x, 0) == oo
# from dir='-'
# Add
assert limit(1 + 1/x, x, 0, dir='-') == -oo
# Pow
assert limit(x**(-2), x, 0, dir='-') == oo
assert limit(x**(-3), x, 0, dir='-') == -oo
assert limit(1/sqrt(x), x, 0, dir='-') == (-oo)*I
assert limit(x**2, x, 0, dir='-') == 0
assert limit(sqrt(x), x, 0, dir='-') == 0
assert limit(x**-pi, x, 0, dir='-') == zoo
assert limit((1 + cos(x))**oo, x, 0) == oo
def test_trigintegrate_mixed():
assert trigintegrate(sin(x)*sec(x), x) == -log(sin(x)**2 - 1)/2
assert trigintegrate(sin(x)*csc(x), x) == x
assert trigintegrate(sin(x)*cot(x), x) == sin(x)
assert trigintegrate(cos(x)*sec(x), x) == x
assert trigintegrate(cos(x)*csc(x), x) == log(cos(x)**2 - 1)/2
assert trigintegrate(cos(x)*tan(x), x) == -cos(x)
assert trigintegrate(cos(x)*cot(x), x) == log(cos(x) - 1)/2 \
- log(cos(x) + 1)/2 + cos(x)
def test_manualintegrate_trigonometry():
assert manualintegrate(sin(x), x) == -cos(x)
assert manualintegrate(tan(x), x) == -log(cos(x))
assert manualintegrate(sec(x), x) == log(sec(x) + tan(x))
assert manualintegrate(csc(x), x) == -log(csc(x) + cot(x))
assert manualintegrate(sin(x) * cos(x), x) in [sin(x) ** 2 / 2, -cos(x)**2 / 2]
assert manualintegrate(-sec(x) * tan(x), x) == -sec(x)
assert manualintegrate(csc(x) * cot(x), x) == -csc(x)
def test_invert_real():
x = Symbol('x', real=True)
x = Dummy(real=True)
n = Symbol('n')
d = Dummy()
assert solveset(abs(x) - n, x) == solveset(abs(x) - d, x) == EmptySet()
n = Symbol('n', real=True)
assert invert_real(x + 3, y, x) == (x, FiniteSet(y - 3))
assert invert_real(x*3, y, x) == (x, FiniteSet(y / 3))
assert invert_real(exp(x), y, x) == (x, FiniteSet(log(y)))
assert invert_real(exp(3*x), y, x) == (x, FiniteSet(log(y) / 3))
assert invert_real(exp(x + 3), y, x) == (x, FiniteSet(log(y) - 3))
assert invert_real(exp(x) + 3, y, x) == (x, FiniteSet(log(y - 3)))
assert invert_real(exp(x)*3, y, x) == (x, FiniteSet(log(y / 3)))
assert invert_real(log(x), y, x) == (x, FiniteSet(exp(y)))
assert invert_real(log(3*x), y, x) == (x, FiniteSet(exp(y) / 3))
assert invert_real(log(x + 3), y, x) == (x, FiniteSet(exp(y) - 3))
assert invert_real(Abs(x), y, x) == (x, FiniteSet(-y, y))
assert invert_real(2**x, y, x) == (x, FiniteSet(log(y)/log(2)))
assert invert_real(2**exp(x), y, x) == (x, FiniteSet(log(log(y)/log(2))))
assert invert_real(x**2, y, x) == (x, FiniteSet(sqrt(y), -sqrt(y)))
assert invert_real(x**Rational(1, 2), y, x) == (x, FiniteSet(y**2))
raises(ValueError, lambda: invert_real(x, x, x))
raises(ValueError, lambda: invert_real(x**pi, y, x))
raises(ValueError, lambda: invert_real(S.One, y, x))
assert invert_real(x**31 + x, y, x) == (x**31 + x, FiniteSet(y))
assert invert_real(Abs(x**31 + x + 1), y, x) == (x**31 + x,
FiniteSet(-y - 1, y - 1))
assert invert_real(tan(x), y, x) == \
(x, imageset(Lambda(n, n*pi + atan(y)), S.Integers))
assert invert_real(tan(exp(x)), y, x) == \
(x, imageset(Lambda(n, log(n*pi + atan(y))), S.Integers))
assert invert_real(cot(x), y, x) == \
(x, imageset(Lambda(n, n*pi + acot(y)), S.Integers))
assert invert_real(cot(exp(x)), y, x) == \
(x, imageset(Lambda(n, log(n*pi + acot(y))), S.Integers))
assert invert_real(tan(tan(x)), y, x) == \
(tan(x), imageset(Lambda(n, n*pi + atan(y)), S.Integers))
x = Symbol('x', positive=True)
assert invert_real(x**pi, y, x) == (x, FiniteSet(y**(1/pi)))
def test_hyperbolic_simp():
x, y = symbols('x,y')
assert trigsimp(sinh(x)**2 + 1) == cosh(x)**2
assert trigsimp(cosh(x)**2 - 1) == sinh(x)**2
assert trigsimp(cosh(x)**2 - sinh(x)**2) == 1
assert trigsimp(1 - tanh(x)**2) == 1/cosh(x)**2
assert trigsimp(1 - 1/cosh(x)**2) == tanh(x)**2
assert trigsimp(tanh(x)**2 + 1/cosh(x)**2) == 1
assert trigsimp(coth(x)**2 - 1) == 1/sinh(x)**2
assert trigsimp(1/sinh(x)**2 + 1) == 1/tanh(x)**2
assert trigsimp(coth(x)**2 - 1/sinh(x)**2) == 1
assert trigsimp(5*cosh(x)**2 - 5*sinh(x)**2) == 5
assert trigsimp(5*cosh(x/2)**2 - 2*sinh(x/2)**2) == 3*cosh(x)/2 + S(7)/2
assert trigsimp(sinh(x)/cosh(x)) == tanh(x)
assert trigsimp(tanh(x)) == trigsimp(sinh(x)/cosh(x))
assert trigsimp(cosh(x)/sinh(x)) == 1/tanh(x)
assert trigsimp(2*tanh(x)*cosh(x)) == 2*sinh(x)
assert trigsimp(coth(x)**3*sinh(x)**3) == cosh(x)**3
assert trigsimp(y*tanh(x)**2/sinh(x)**2) == y/cosh(x)**2
assert trigsimp(coth(x)/cosh(x)) == 1/sinh(x)
for a in (pi/6*I, pi/4*I, pi/3*I):
assert trigsimp(sinh(a)*cosh(x) + cosh(a)*sinh(x)) == sinh(x + a)
assert trigsimp(-sinh(a)*cosh(x) + cosh(a)*sinh(x)) == sinh(x - a)
e = 2*cosh(x)**2 - 2*sinh(x)**2
assert trigsimp(log(e)) == log(2)
assert trigsimp(cosh(x)**2*cosh(y)**2 - cosh(x)**2*sinh(y)**2 - sinh(x)**2,
recursive=True) == 1
assert trigsimp(sinh(x)**2*sinh(y)**2 - sinh(x)**2*cosh(y)**2 + cosh(x)**2,
recursive=True) == 1
assert abs(trigsimp(2.0*cosh(x)**2 - 2.0*sinh(x)**2) - 2.0) < 1e-10
assert trigsimp(sinh(x)**2/cosh(x)**2) == tanh(x)**2
assert trigsimp(sinh(x)**3/cosh(x)**3) == tanh(x)**3
assert trigsimp(sinh(x)**10/cosh(x)**10) == tanh(x)**10
assert trigsimp(cosh(x)**3/sinh(x)**3) == 1/tanh(x)**3
assert trigsimp(cosh(x)/sinh(x)) == 1/tanh(x)
assert trigsimp(cosh(x)**2/sinh(x)**2) == 1/tanh(x)**2
assert trigsimp(cosh(x)**10/sinh(x)**10) == 1/tanh(x)**10
assert trigsimp(x*cosh(x)*tanh(x)) == x*sinh(x)
assert trigsimp(-sinh(x) + cosh(x)*tanh(x)) == 0
assert tan(x) != 1/cot(x) # cot doesn't auto-simplify
assert trigsimp(tan(x) - 1/cot(x)) == 0
assert trigsimp(3*tanh(x)**7 - 2/coth(x)**7) == tanh(x)**7
def test_real_imag():
a,b = symbols('a,b', real=True)
z = a+b*I
for deep in [True, False]:
assert sin(z).as_real_imag(deep=deep) == (sin(a)*cosh(b), cos(a)*sinh(b))
assert cos(z).as_real_imag(deep=deep) == (cos(a)*cosh(b), -sin(a)*sinh(b))
assert tan(z).as_real_imag(deep=deep) == (sin(a)*cos(a)/(cos(a)**2+sinh(b)**2), sinh(b)*cosh(b)/(cos(a)**2+sinh(b)**2))
assert cot(z).as_real_imag(deep=deep) == (sin(a)*cos(a)/(sin(a)**2+sinh(b)**2), -sinh(b)*cosh(b)/(sin(a)**2+sinh(b)**2))
assert sin(a).as_real_imag(deep=deep) == (sin(a), 0)
assert cos(a).as_real_imag(deep=deep) == (cos(a), 0)
assert tan(a).as_real_imag(deep=deep) == (tan(a), 0)
assert cot(a).as_real_imag(deep=deep) == (cot(a), 0)
def test_cos_rewrite():
assert cos(x).rewrite(exp) == exp(I * x) / 2 + exp(-I * x) / 2
assert cos(x).rewrite(tan) == (1 - tan(x / 2) ** 2) / (1 + tan(x / 2) ** 2)
assert cos(x).rewrite(cot) == -(1 - cot(x / 2) ** 2) / (1 + cot(x / 2) ** 2)
assert cos(sinh(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, sinh(3)).n()
assert cos(cosh(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, cosh(3)).n()
assert cos(tanh(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, tanh(3)).n()
assert cos(coth(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, coth(3)).n()
assert cos(sin(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, sin(3)).n()
assert cos(cos(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, cos(3)).n()
assert cos(tan(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, tan(3)).n()
assert cos(cot(x)).rewrite(exp).subs(x, 3).n() == cos(x).rewrite(exp).subs(x, cot(3)).n()
assert cos(log(x)).rewrite(Pow) == x ** I / 2 + x ** -I / 2
def test_trigsimp1a():
assert trigsimp(sin(2)**2*cos(3)*exp(2)/cos(2)**2) == tan(2)**2*cos(3)*exp(2)
assert trigsimp(tan(2)**2*cos(3)*exp(2)*cos(2)**2) == sin(2)**2*cos(3)*exp(2)
assert trigsimp(cot(2)*cos(3)*exp(2)*sin(2)) == cos(3)*exp(2)*cos(2)
assert trigsimp(tan(2)*cos(3)*exp(2)/sin(2)) == cos(3)*exp(2)/cos(2)
assert trigsimp(cot(2)*cos(3)*exp(2)/cos(2)) == cos(3)*exp(2)/sin(2)
assert trigsimp(cot(2)*cos(3)*exp(2)*tan(2)) == cos(3)*exp(2)
assert trigsimp(sinh(2)*cos(3)*exp(2)/cosh(2)) == tanh(2)*cos(3)*exp(2)
assert trigsimp(tanh(2)*cos(3)*exp(2)*cosh(2)) == sinh(2)*cos(3)*exp(2)
assert trigsimp(coth(2)*cos(3)*exp(2)*sinh(2)) == cosh(2)*cos(3)*exp(2)
assert trigsimp(tanh(2)*cos(3)*exp(2)/sinh(2)) == cos(3)*exp(2)/cosh(2)
assert trigsimp(coth(2)*cos(3)*exp(2)/cosh(2)) == cos(3)*exp(2)/sinh(2)
assert trigsimp(coth(2)*cos(3)*exp(2)*tanh(2)) == cos(3)*exp(2)
def test_sin_rewrite():
assert sin(x).rewrite(exp) == -I * (exp(I * x) - exp(-I * x)) / 2
assert sin(x).rewrite(tan) == 2 * tan(x / 2) / (1 + tan(x / 2) ** 2)
assert sin(x).rewrite(cot) == 2 * cot(x / 2) / (1 + cot(x / 2) ** 2)
assert sin(sinh(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, sinh(3)).n()
assert sin(cosh(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, cosh(3)).n()
assert sin(tanh(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, tanh(3)).n()
assert sin(coth(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, coth(3)).n()
assert sin(sin(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, sin(3)).n()
assert sin(cos(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, cos(3)).n()
assert sin(tan(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, tan(3)).n()
assert sin(cot(x)).rewrite(exp).subs(x, 3).n() == sin(x).rewrite(exp).subs(x, cot(3)).n()
assert sin(log(x)).rewrite(Pow) == I * x ** -I / 2 - I * x ** I / 2
def eval(cls, arg):
from sympy import cot
arg = sympify(arg)
if arg.is_Number:
if arg is S.NaN:
return S.NaN
elif arg is S.Infinity:
return S.One
elif arg is S.NegativeInfinity:
return S.NegativeOne
elif arg is S.Zero:
return S.ComplexInfinity
elif arg.is_negative:
return -cls(-arg)
else:
if arg is S.ComplexInfinity:
return S.NaN
i_coeff = arg.as_coefficient(S.ImaginaryUnit)
if i_coeff is not None:
if _coeff_isneg(i_coeff):
return S.ImaginaryUnit * cot(-i_coeff)
return -S.ImaginaryUnit * cot(i_coeff)
else:
if _coeff_isneg(arg):
return -cls(-arg)
if arg.is_Add:
x, m = _peeloff_ipi(arg)
if m:
cothm = coth(m)
if cothm is S.ComplexInfinity:
return coth(x)
else: # cothm == 0
return tanh(x)
if arg.func == asinh:
x = arg.args[0]
return sqrt(1 + x**2)/x
if arg.func == acosh:
x = arg.args[0]
return x/(sqrt(x - 1) * sqrt(x + 1))
if arg.func == atanh:
return 1/arg.args[0]
if arg.func == acoth:
return arg.args[0]
def test_issue1448():
x = Symbol('x')
assert cot(x).inverse() == acot
assert sin(x).rewrite(cot) == 2*cot(x/2)/(1 + cot(x/2)**2)
assert cos(x).rewrite(cot) == -(1 - cot(x/2)**2)/(1 + cot(x/2)**2)
assert tan(x).rewrite(cot) == 1/cot(x)
assert cot(x).fdiff() == -1 - cot(x)**2
def test_TR13():
assert TR13(tan(3)*tan(2)) == -tan(2)/tan(5) - tan(3)/tan(5) + 1
assert TR13(cot(3)*cot(2)) == 1 + cot(3)*cot(5) + cot(2)*cot(5)
assert TR13(tan(1)*tan(2)*tan(3)) == \
(-tan(2)/tan(5) - tan(3)/tan(5) + 1)*tan(1)
assert TR13(tan(1)*tan(2)*cot(3)) == \
(-tan(2)/tan(3) + 1 - tan(1)/tan(3))*cot(3)
def test_periodicity():
x = Symbol('x')
y = Symbol('y')
assert periodicity(sin(2*x), x) == pi
assert periodicity((-2)*tan(4*x), x) == pi/4
assert periodicity(sin(x)**2, x) == 2*pi
assert periodicity(3**tan(3*x), x) == pi/3
assert periodicity(tan(x)*cos(x), x) == 2*pi
assert periodicity(sin(x)**(tan(x)), x) == 2*pi
assert periodicity(tan(x)*sec(x), x) == 2*pi
assert periodicity(sin(2*x)*cos(2*x) - y, x) == pi/2
assert periodicity(tan(x) + cot(x), x) == pi
assert periodicity(sin(x) - cos(2*x), x) == 2*pi
assert periodicity(sin(x) - 1, x) == 2*pi
assert periodicity(sin(4*x) + sin(x)*cos(x), x) == pi
assert periodicity(exp(sin(x)), x) == 2*pi
assert periodicity(log(cot(2*x)) - sin(cos(2*x)), x) == pi
assert periodicity(sin(2*x)*exp(tan(x) - csc(2*x)), x) == pi
assert periodicity(cos(sec(x) - csc(2*x)), x) == 2*pi
assert periodicity(tan(sin(2*x)), x) == pi
assert periodicity(2*tan(x)**2, x) == pi
assert periodicity(sin(x%4), x) == 4
assert periodicity(sin(x)%4, x) == 2*pi
assert periodicity(tan((3*x-2)%4), x) == 4/3
assert periodicity((sqrt(2)*(x+1)+x) % 3, x) == 3 / (sqrt(2)+1)
assert periodicity((x**2+1) % x, x) == None
assert periodicity(sin(x)**2 + cos(x)**2, x) == S.Zero
assert periodicity(tan(x), y) == S.Zero
assert periodicity(exp(x), x) is None
assert periodicity(log(x), x) is None
assert periodicity(exp(x)**sin(x), x) is None
assert periodicity(sin(x)**y, y) is None
assert periodicity(Abs(sin(Abs(sin(x)))),x) == pi
assert all(periodicity(Abs(f(x)),x) == pi for f in (
cos, sin, sec, csc, tan, cot))
assert periodicity(Abs(sin(tan(x))), x) == pi
assert periodicity(Abs(sin(sin(x) + tan(x))), x) == 2*pi
assert periodicity(sin(x) > S.Half, x) is 2*pi
assert periodicity(x > 2, x) is None
assert periodicity(x**3 - x**2 + 1, x) is None
assert periodicity(Abs(x), x) is None
assert periodicity(Abs(x**2 - 1), x) is None
assert periodicity((x**2 + 4)%2, x) is None
assert periodicity((E**x)%3, x) is None
def test_manualintegrate_trigpowers():
assert manualintegrate(sin(x)**2 * cos(x), x) == sin(x)**3 / 3
assert manualintegrate(sin(x)**2 * cos(x) **2, x) == \
x / 8 - sin(4*x) / 32
assert manualintegrate(sin(x) * cos(x)**3, x) == -cos(x)**4 / 4
assert manualintegrate(sin(x)**3 * cos(x)**2, x) == \
cos(x)**5 / 5 - cos(x)**3 / 3
assert manualintegrate(tan(x)**3 * sec(x), x) == sec(x)**3/3 - sec(x)
assert manualintegrate(tan(x) * sec(x) **2, x) == sec(x)**2/2
assert manualintegrate(cot(x)**5 * csc(x), x) == \
-csc(x)**5/5 + 2*csc(x)**3/3 - csc(x)
assert manualintegrate(cot(x)**2 * csc(x)**6, x) == \
-cot(x)**7/7 - 2*cot(x)**5/5 - cot(x)**3/3
def test_tan_rewrite():
x = Symbol('x')
neg_exp, pos_exp = exp(-x*I), exp(x*I)
assert tan(x).rewrite(exp) == I*(neg_exp-pos_exp)/(neg_exp+pos_exp)
assert tan(x).rewrite(sin) == 2*sin(x)**2/sin(2*x)
assert tan(x).rewrite(cos) == -cos(x + S.Pi/2)/cos(x)
assert tan(x).rewrite(cot) == 1/cot(x)
def test_tan_rewrite():
x = Symbol('x')
neg_exp, pos_exp = exp(-x*I), exp(x*I)
assert tan(x).rewrite(exp) == I*(neg_exp-pos_exp)/(neg_exp+pos_exp)
assert tan(x).rewrite(sin) == 2*sin(x)**2/sin(2*x)
assert tan(x).rewrite(cos) == -cos(x + S.Pi/2)/cos(x)
assert tan(x).rewrite(cot) == 1/cot(x)
assert tan(sinh(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, sinh(3)).n()
assert tan(cosh(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, cosh(3)).n()
assert tan(tanh(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, tanh(3)).n()
assert tan(coth(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, coth(3)).n()
assert tan(sin(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, sin(3)).n()
assert tan(cos(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, cos(3)).n()
assert tan(tan(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, tan(3)).n()
assert tan(cot(x)).rewrite(exp).subs(x, 3).n() == tan(x).rewrite(exp).subs(x, cot(3)).n()
assert tan(log(x)).rewrite(Pow) == I*(x**-I - x**I)/(x**-I + x**I)
def test_Ynm():
# http://en.wikipedia.org/wiki/Spherical_harmonics
th, ph = Symbol("theta", real=True), Symbol("phi", real=True)
from sympy.abc import n, m
assert Ynm(0, 0, th, ph).expand(func=True) == 1 / (2 * sqrt(pi))
assert Ynm(1, -1, th, ph) == -exp(-2 * I * ph) * Ynm(1, 1, th, ph)
assert Ynm(1, -1, th, ph).expand(func=True) == sqrt(6) * sin(th) * exp(-I * ph) / (4 * sqrt(pi))
assert Ynm(1, -1, th, ph).expand(func=True) == sqrt(6) * sin(th) * exp(-I * ph) / (4 * sqrt(pi))
assert Ynm(1, 0, th, ph).expand(func=True) == sqrt(3) * cos(th) / (2 * sqrt(pi))
assert Ynm(1, 1, th, ph).expand(func=True) == -sqrt(6) * sin(th) * exp(I * ph) / (4 * sqrt(pi))
assert Ynm(2, 0, th, ph).expand(func=True) == 3 * sqrt(5) * cos(th) ** 2 / (4 * sqrt(pi)) - sqrt(5) / (4 * sqrt(pi))
assert Ynm(2, 1, th, ph).expand(func=True) == -sqrt(30) * sin(th) * exp(I * ph) * cos(th) / (4 * sqrt(pi))
assert Ynm(2, -2, th, ph).expand(func=True) == (
-sqrt(30) * exp(-2 * I * ph) * cos(th) ** 2 / (8 * sqrt(pi)) + sqrt(30) * exp(-2 * I * ph) / (8 * sqrt(pi))
)
assert Ynm(2, 2, th, ph).expand(func=True) == (
-sqrt(30) * exp(2 * I * ph) * cos(th) ** 2 / (8 * sqrt(pi)) + sqrt(30) * exp(2 * I * ph) / (8 * sqrt(pi))
)
assert diff(Ynm(n, m, th, ph), th) == (
m * cot(th) * Ynm(n, m, th, ph) + sqrt((-m + n) * (m + n + 1)) * exp(-I * ph) * Ynm(n, m + 1, th, ph)
)
assert diff(Ynm(n, m, th, ph), ph) == I * m * Ynm(n, m, th, ph)
assert conjugate(Ynm(n, m, th, ph)) == (-1) ** (2 * m) * exp(-2 * I * m * ph) * Ynm(n, m, th, ph)
assert Ynm(n, m, -th, ph) == Ynm(n, m, th, ph)
assert Ynm(n, m, th, -ph) == exp(-2 * I * m * ph) * Ynm(n, m, th, ph)
assert Ynm(n, -m, th, ph) == (-1) ** m * exp(-2 * I * m * ph) * Ynm(n, m, th, ph)
def test_conv7():
x = Symbol("x")
y = Symbol("y")
assert sin(x/3) == sin(sympy.Symbol("x") / 3)
assert cos(x/3) == cos(sympy.Symbol("x") / 3)
assert tan(x/3) == tan(sympy.Symbol("x") / 3)
assert cot(x/3) == cot(sympy.Symbol("x") / 3)
assert csc(x/3) == csc(sympy.Symbol("x") / 3)
assert sec(x/3) == sec(sympy.Symbol("x") / 3)
assert asin(x/3) == asin(sympy.Symbol("x") / 3)
assert acos(x/3) == acos(sympy.Symbol("x") / 3)
assert atan(x/3) == atan(sympy.Symbol("x") / 3)
assert acot(x/3) == acot(sympy.Symbol("x") / 3)
assert acsc(x/3) == acsc(sympy.Symbol("x") / 3)
assert asec(x/3) == asec(sympy.Symbol("x") / 3)
assert sin(x/3)._sympy_() == sympy.sin(sympy.Symbol("x") / 3)
assert sin(x/3)._sympy_() != sympy.cos(sympy.Symbol("x") / 3)
assert cos(x/3)._sympy_() == sympy.cos(sympy.Symbol("x") / 3)
assert tan(x/3)._sympy_() == sympy.tan(sympy.Symbol("x") / 3)
assert cot(x/3)._sympy_() == sympy.cot(sympy.Symbol("x") / 3)
assert csc(x/3)._sympy_() == sympy.csc(sympy.Symbol("x") / 3)
assert sec(x/3)._sympy_() == sympy.sec(sympy.Symbol("x") / 3)
assert asin(x/3)._sympy_() == sympy.asin(sympy.Symbol("x") / 3)
assert acos(x/3)._sympy_() == sympy.acos(sympy.Symbol("x") / 3)
assert atan(x/3)._sympy_() == sympy.atan(sympy.Symbol("x") / 3)
assert acot(x/3)._sympy_() == sympy.acot(sympy.Symbol("x") / 3)
assert acsc(x/3)._sympy_() == sympy.acsc(sympy.Symbol("x") / 3)
assert asec(x/3)._sympy_() == sympy.asec(sympy.Symbol("x") / 3)
def test_tancot_rewrite_sqrt():
# equivalent to testing rewrite(pow)
for p in [1, 3, 5, 17, 3*5*17]:
for t in [1, 8]:
n = t*p
for i in xrange(1, (n + 1)//2 + 1):
if 1 == gcd(i, n):
x = i*pi/n
if 2*i != n and 3*i != 2*n:
t1 = tan(x).rewrite(sqrt)
assert not t1.has(cot, tan), "fails for %d*pi/%d" % (i, n)
assert 1e-10 > abs( tan(float(x)) - float(t1) )
if i != 0 and i != n:
c1 = cot(x).rewrite(sqrt)
assert not c1.has(cot, tan), "fails for %d*pi/%d" % (i, n)
assert 1e-10 > abs( cot(float(x)) - float(c1) )
def test_TR2():
assert TR2(tan(x)) == sin(x) / cos(x)
assert TR2(cot(x)) == cos(x) / sin(x)
assert TR2(tan(tan(x) - sin(x) / cos(x))) == 0
def test_cot_subs():
assert cot(x).subs(cot(x), y) == y
assert cot(x).subs(x, y) == cot(y)
assert cot(x).subs(x, 0) == zoo
assert cot(x).subs(x, S.Pi) == zoo
def test_cot():
assert cot(nan) == nan
assert cot.nargs == FiniteSet(1)
assert cot(oo * I) == -I
assert cot(-oo * I) == I
assert cot(0) == zoo
assert cot(2 * pi) == zoo
assert cot(acot(x)) == x
assert cot(atan(x)) == 1 / x
assert cot(asin(x)) == sqrt(1 - x**2) / x
assert cot(acos(x)) == x / sqrt(1 - x**2)
assert cot(atan2(y, x)) == x / y
assert cot(pi * I) == -coth(pi) * I
assert cot(-pi * I) == coth(pi) * I
assert cot(-2 * I) == coth(2) * I
assert cot(pi) == cot(2 * pi) == cot(3 * pi)
assert cot(-pi) == cot(-2 * pi) == cot(-3 * pi)
assert cot(pi / 2) == 0
assert cot(-pi / 2) == 0
assert cot(5 * pi / 2) == 0
assert cot(7 * pi / 2) == 0
assert cot(pi / 3) == 1 / sqrt(3)
assert cot(-2 * pi / 3) == 1 / sqrt(3)
assert cot(pi / 4) == S.One
assert cot(-pi / 4) == -S.One
assert cot(17 * pi / 4) == S.One
assert cot(-3 * pi / 4) == S.One
assert cot(pi / 6) == sqrt(3)
assert cot(-pi / 6) == -sqrt(3)
assert cot(7 * pi / 6) == sqrt(3)
assert cot(-5 * pi / 6) == sqrt(3)
assert cot(x * I) == -coth(x) * I
assert cot(k * pi * I) == -coth(k * pi) * I
assert cot(r).is_real is True
assert cot(a).is_algebraic is None
assert cot(na).is_algebraic is False
assert cot(10 * pi / 7) == cot(3 * pi / 7)
assert cot(11 * pi / 7) == -cot(3 * pi / 7)
assert cot(-11 * pi / 7) == cot(3 * pi / 7)
assert cot(x).is_finite is None
assert cot(r).is_finite is None
i = Symbol('i', imaginary=True)
assert cot(i).is_finite is True
assert cot(x).subs(x, 3 * pi) == zoo
def test_periodicity():
x = Symbol('x')
y = Symbol('y')
z = Symbol('z', real=True)
assert periodicity(sin(2 * x), x) == pi
assert periodicity((-2) * tan(4 * x), x) == pi / 4
assert periodicity(sin(x)**2, x) == 2 * pi
assert periodicity(3**tan(3 * x), x) == pi / 3
assert periodicity(tan(x) * cos(x), x) == 2 * pi
assert periodicity(sin(x)**(tan(x)), x) == 2 * pi
assert periodicity(tan(x) * sec(x), x) == 2 * pi
assert periodicity(sin(2 * x) * cos(2 * x) - y, x) == pi / 2
assert periodicity(tan(x) + cot(x), x) == pi
assert periodicity(sin(x) - cos(2 * x), x) == 2 * pi
assert periodicity(sin(x) - 1, x) == 2 * pi
assert periodicity(sin(4 * x) + sin(x) * cos(x), x) == pi
assert periodicity(exp(sin(x)), x) == 2 * pi
assert periodicity(log(cot(2 * x)) - sin(cos(2 * x)), x) == pi
assert periodicity(sin(2 * x) * exp(tan(x) - csc(2 * x)), x) == pi
assert periodicity(cos(sec(x) - csc(2 * x)), x) == 2 * pi
assert periodicity(tan(sin(2 * x)), x) == pi
assert periodicity(2 * tan(x)**2, x) == pi
assert periodicity(sin(x % 4), x) == 4
assert periodicity(sin(x) % 4, x) == 2 * pi
assert periodicity(tan((3 * x - 2) % 4), x) == S(4) / 3
assert periodicity((sqrt(2) * (x + 1) + x) % 3, x) == 3 / (sqrt(2) + 1)
assert periodicity((x**2 + 1) % x, x) == None
assert periodicity(sin(re(x)), x) == 2 * pi
assert periodicity(sin(x)**2 + cos(x)**2, x) == S.Zero
assert periodicity(tan(x), y) == S.Zero
assert periodicity(sin(x) + I * cos(x), x) == 2 * pi
assert periodicity(x - sin(2 * y), y) == pi
assert periodicity(exp(x), x) is None
assert periodicity(exp(I * x), x) == 2 * pi
assert periodicity(exp(I * z), z) == 2 * pi
assert periodicity(exp(z), z) is None
assert periodicity(exp(log(sin(z) + I * cos(2 * z)), evaluate=False),
z) == 2 * pi
assert periodicity(exp(log(sin(2 * z) + I * cos(z)), evaluate=False),
z) == 2 * pi
assert periodicity(exp(sin(z)), z) == 2 * pi
assert periodicity(exp(2 * I * z), z) == pi
assert periodicity(exp(z + I * sin(z)), z) is None
assert periodicity(exp(cos(z / 2) + sin(z)), z) == 4 * pi
assert periodicity(log(x), x) is None
assert periodicity(exp(x)**sin(x), x) is None
assert periodicity(sin(x)**y, y) is None
assert periodicity(Abs(sin(Abs(sin(x)))), x) == pi
assert all(
periodicity(Abs(f(x)), x) == pi
for f in (cos, sin, sec, csc, tan, cot))
assert periodicity(Abs(sin(tan(x))), x) == pi
assert periodicity(Abs(sin(sin(x) + tan(x))), x) == 2 * pi
assert periodicity(sin(x) > S.Half, x) is 2 * pi
assert periodicity(x > 2, x) is None
assert periodicity(x**3 - x**2 + 1, x) is None
assert periodicity(Abs(x), x) is None
assert periodicity(Abs(x**2 - 1), x) is None
assert periodicity((x**2 + 4) % 2, x) is None
assert periodicity((E**x) % 3, x) is None
assert periodicity(sin(expint(1, x)) / expint(1, x), x) is None
def test_latex_functions():
assert latex(exp(x)) == "e^{x}"
assert latex(exp(1) + exp(2)) == "e + e^{2}"
f = Function('f')
assert latex(f(x)) == '\\operatorname{f}{\\left (x \\right )}'
beta = Function('beta')
assert latex(beta(x)) == r"\beta{\left (x \right )}"
assert latex(sin(x)) == r"\sin{\left (x \right )}"
assert latex(sin(x), fold_func_brackets=True) == r"\sin {x}"
assert latex(sin(2*x**2), fold_func_brackets=True) == \
r"\sin {2 x^{2}}"
assert latex(sin(x**2), fold_func_brackets=True) == \
r"\sin {x^{2}}"
assert latex(asin(x)**2) == r"\operatorname{asin}^{2}{\left (x \right )}"
assert latex(asin(x)**2, inv_trig_style="full") == \
r"\arcsin^{2}{\left (x \right )}"
assert latex(asin(x)**2, inv_trig_style="power") == \
r"\sin^{-1}{\left (x \right )}^{2}"
assert latex(asin(x**2), inv_trig_style="power",
fold_func_brackets=True) == \
r"\sin^{-1} {x^{2}}"
assert latex(factorial(k)) == r"k!"
assert latex(factorial(-k)) == r"\left(- k\right)!"
assert latex(factorial2(k)) == r"k!!"
assert latex(factorial2(-k)) == r"\left(- k\right)!!"
assert latex(binomial(2, k)) == r"{\binom{2}{k}}"
assert latex(FallingFactorial(3,
k)) == r"{\left(3\right)}_{\left(k\right)}"
assert latex(RisingFactorial(3, k)) == r"{\left(3\right)}^{\left(k\right)}"
assert latex(floor(x)) == r"\lfloor{x}\rfloor"
assert latex(ceiling(x)) == r"\lceil{x}\rceil"
assert latex(Min(x, 2, x**3)) == r"\min\left(2, x, x^{3}\right)"
assert latex(Max(x, 2, x**3)) == r"\max\left(2, x, x^{3}\right)"
assert latex(Abs(x)) == r"\lvert{x}\rvert"
assert latex(re(x)) == r"\Re{x}"
assert latex(re(x + y)) == r"\Re{x} + \Re{y}"
assert latex(im(x)) == r"\Im{x}"
assert latex(conjugate(x)) == r"\overline{x}"
assert latex(gamma(x)) == r"\Gamma\left(x\right)"
assert latex(Order(x)) == r"\mathcal{O}\left(x\right)"
assert latex(lowergamma(x, y)) == r'\gamma\left(x, y\right)'
assert latex(uppergamma(x, y)) == r'\Gamma\left(x, y\right)'
assert latex(cot(x)) == r'\cot{\left (x \right )}'
assert latex(coth(x)) == r'\coth{\left (x \right )}'
assert latex(re(x)) == r'\Re{x}'
assert latex(im(x)) == r'\Im{x}'
assert latex(root(x, y)) == r'x^{\frac{1}{y}}'
assert latex(arg(x)) == r'\arg{\left (x \right )}'
assert latex(zeta(x)) == r'\zeta\left(x\right)'
assert latex(zeta(x)) == r"\zeta\left(x\right)"
assert latex(zeta(x)**2) == r"\zeta^{2}\left(x\right)"
assert latex(zeta(x, y)) == r"\zeta\left(x, y\right)"
assert latex(zeta(x, y)**2) == r"\zeta^{2}\left(x, y\right)"
assert latex(dirichlet_eta(x)) == r"\eta\left(x\right)"
assert latex(dirichlet_eta(x)**2) == r"\eta^{2}\left(x\right)"
assert latex(polylog(x, y)) == r"\operatorname{Li}_{x}\left(y\right)"
assert latex(polylog(x,
y)**2) == r"\operatorname{Li}_{x}^{2}\left(y\right)"
assert latex(lerchphi(x, y, n)) == r"\Phi\left(x, y, n\right)"
assert latex(lerchphi(x, y, n)**2) == r"\Phi^{2}\left(x, y, n\right)"
assert latex(Ei(x)) == r'\operatorname{Ei}{\left (x \right )}'
assert latex(Ei(x)**2) == r'\operatorname{Ei}^{2}{\left (x \right )}'
assert latex(expint(x, y)**2) == r'\operatorname{E}_{x}^{2}\left(y\right)'
assert latex(Shi(x)**2) == r'\operatorname{Shi}^{2}{\left (x \right )}'
assert latex(Si(x)**2) == r'\operatorname{Si}^{2}{\left (x \right )}'
assert latex(Ci(x)**2) == r'\operatorname{Ci}^{2}{\left (x \right )}'
assert latex(Chi(x)**2) == r'\operatorname{Chi}^{2}{\left (x \right )}'
# Test latex printing of function names with "_"
assert latex(
polar_lift(0)) == r"\operatorname{polar\_lift}{\left (0 \right )}"
assert latex(polar_lift(0)**
3) == r"\operatorname{polar\_lift}^{3}{\left (0 \right )}"
def test_issue_4329():
assert tan(x).series(x, pi / 2,
n=3).removeO() == -pi / 6 + x / 3 - 1 / (x - pi / 2)
assert cot(x).series(x, pi,
n=3).removeO() == -x / 3 + pi / 3 + 1 / (x - pi)
assert limit(tan(x)**tan(2 * x), x, pi / 4) == exp(-1)
def cotcsc_pattern(symbol):
a, b, m, n = make_wilds(symbol)
pattern = sympy.cot(a * symbol)**m * sympy.csc(b * symbol)**n
return pattern, a, b, m, n
def test_inverse_mellin_transform():
from sympy import (sin, simplify, expand_func, powsimp, Max, Min, expand,
powdenest, powsimp, exp_polar, combsimp, cos, cot)
IMT = inverse_mellin_transform
assert IMT(gamma(s), s, x, (0, oo)) == exp(-x)
assert IMT(gamma(-s), s, x, (-oo, 0)) == exp(-1 / x)
assert simplify(IMT(s/(2*s**2 - 2), s, x, (2, oo))) == \
(x**2 + 1)*Heaviside(1 - x)/(4*x)
# test passing "None"
assert IMT(1/(s**2 - 1), s, x, (-1, None)) == \
-x*Heaviside(-x + 1)/2 - Heaviside(x - 1)/(2*x)
assert IMT(1/(s**2 - 1), s, x, (None, 1)) == \
-x*Heaviside(-x + 1)/2 - Heaviside(x - 1)/(2*x)
# test expansion of sums
assert IMT(gamma(s) + gamma(s - 1), s, x, (1, oo)) == (x + 1) * exp(-x) / x
# test factorisation of polys
r = symbols('r', real=True)
assert IMT(1/(s**2 + 1), s, exp(-x), (None, oo)
).subs(x, r).rewrite(sin).simplify() \
== sin(r)*Heaviside(1 - exp(-r))
# test multiplicative substitution
_a, _b = symbols('a b', positive=True)
assert IMT(_b**(-s / _a) * factorial(s / _a) / s, s, x,
(0, oo)) == exp(-_b * x**_a)
assert IMT(factorial(_a / _b + s / _b) / (_a + s), s, x,
(-_a, oo)) == x**_a * exp(-x**_b)
def simp_pows(expr):
return simplify(powsimp(expand_mul(expr, deep=False),
force=True)).replace(exp_polar, exp)
# Now test the inverses of all direct transforms tested above
# Section 8.4.2
assert IMT(-1 / (nu + s), s, x, (-oo, None)) == x**nu * Heaviside(x - 1)
assert IMT(1 / (nu + s), s, x, (None, oo)) == x**nu * Heaviside(1 - x)
assert simp_pows(IMT(gamma(beta)*gamma(s)/gamma(s + beta), s, x, (0, oo))) \
== (1 - x)**(beta - 1)*Heaviside(1 - x)
assert simp_pows(IMT(gamma(beta)*gamma(1 - beta - s)/gamma(1 - s),
s, x, (-oo, None))) \
== (x - 1)**(beta - 1)*Heaviside(x - 1)
assert simp_pows(IMT(gamma(s)*gamma(rho - s)/gamma(rho), s, x, (0, None))) \
== (1/(x + 1))**rho
assert simp_pows(IMT(d**c*d**(s - 1)*sin(pi*c)
*gamma(s)*gamma(s + c)*gamma(1 - s)*gamma(1 - s - c)/pi,
s, x, (Max(-re(c), 0), Min(1 - re(c), 1)))) \
== (x**c - d**c)/(x - d)
assert simplify(IMT(1/sqrt(pi)*(-c/2)*gamma(s)*gamma((1 - c)/2 - s)
*gamma(-c/2 - s)/gamma(1 - c - s),
s, x, (0, -re(c)/2))) == \
(1 + sqrt(x + 1))**c
assert simplify(IMT(2**(a + 2*s)*b**(a + 2*s - 1)*gamma(s)*gamma(1 - a - 2*s)
/gamma(1 - a - s), s, x, (0, (-re(a) + 1)/2))) == \
b**(a - 1)*(sqrt(1 + x/b**2) + 1)**(a - 1)*(b**2*sqrt(1 + x/b**2) +
b**2 + x)/(b**2 + x)
assert simplify(IMT(-2**(c + 2*s)*c*b**(c + 2*s)*gamma(s)*gamma(-c - 2*s)
/ gamma(-c - s + 1), s, x, (0, -re(c)/2))) == \
b**c*(sqrt(1 + x/b**2) + 1)**c
# Section 8.4.5
assert IMT(24 / s**5, s, x, (0, oo)) == log(x)**4 * Heaviside(1 - x)
assert expand(IMT(6/s**4, s, x, (-oo, 0)), force=True) == \
log(x)**3*Heaviside(x - 1)
assert IMT(pi / (s * sin(pi * s)), s, x, (-1, 0)) == log(x + 1)
assert IMT(pi / (s * sin(pi * s / 2)), s, x, (-2, 0)) == log(x**2 + 1)
assert IMT(pi / (s * sin(2 * pi * s)), s, x,
(-S(1) / 2, 0)) == log(sqrt(x) + 1)
assert IMT(pi / (s * sin(pi * s)), s, x, (0, 1)) == log(1 + 1 / x)
# TODO
def mysimp(expr):
from sympy import expand, logcombine, powsimp
return expand(powsimp(logcombine(expr, force=True),
force=True,
deep=True),
force=True).replace(exp_polar, exp)
assert mysimp(mysimp(IMT(pi / (s * tan(pi * s)), s, x, (-1, 0)))) in [
log(1 - x) * Heaviside(1 - x) + log(x - 1) * Heaviside(x - 1),
log(x) * Heaviside(x - 1) + log(1 - 1 / x) * Heaviside(x - 1) +
log(-x + 1) * Heaviside(-x + 1)
]
# test passing cot
assert mysimp(IMT(pi * cot(pi * s) / s, s, x, (0, 1))) in [
log(1 / x - 1) * Heaviside(1 - x) + log(1 - 1 / x) * Heaviside(x - 1),
-log(x) * Heaviside(-x + 1) + log(1 - 1 / x) * Heaviside(x - 1) +
log(-x + 1) * Heaviside(-x + 1),
]
# 8.4.14
assert IMT(-gamma(s + S(1)/2)/(sqrt(pi)*s), s, x, (-S(1)/2, 0)) == \
erf(sqrt(x))
# 8.4.19
assert simplify(IMT(gamma(a/2 + s)/gamma(a/2 - s + 1), s, x, (-re(a)/2, S(3)/4))) \
== besselj(a, 2*sqrt(x))
assert simplify(IMT(2**a*gamma(S(1)/2 - 2*s)*gamma(s + (a + 1)/2)
/ (gamma(1 - s - a/2)*gamma(1 - 2*s + a)),
s, x, (-(re(a) + 1)/2, S(1)/4))) == \
sin(sqrt(x))*besselj(a, sqrt(x))
assert simplify(IMT(2**a*gamma(a/2 + s)*gamma(S(1)/2 - 2*s)
/ (gamma(S(1)/2 - s - a/2)*gamma(1 - 2*s + a)),
s, x, (-re(a)/2, S(1)/4))) == \
cos(sqrt(x))*besselj(a, sqrt(x))
# TODO this comes out as an amazing mess, but simplifies nicely
assert simplify(IMT(gamma(a + s)*gamma(S(1)/2 - s)
/ (sqrt(pi)*gamma(1 - s)*gamma(1 + a - s)),
s, x, (-re(a), S(1)/2))) == \
besselj(a, sqrt(x))**2
assert simplify(IMT(gamma(s)*gamma(S(1)/2 - s)
/ (sqrt(pi)*gamma(1 - s - a)*gamma(1 + a - s)),
s, x, (0, S(1)/2))) == \
besselj(-a, sqrt(x))*besselj(a, sqrt(x))
assert simplify(IMT(4**s*gamma(-2*s + 1)*gamma(a/2 + b/2 + s)
/ (gamma(-a/2 + b/2 - s + 1)*gamma(a/2 - b/2 - s + 1)
*gamma(a/2 + b/2 - s + 1)),
s, x, (-(re(a) + re(b))/2, S(1)/2))) == \
besselj(a, sqrt(x))*besselj(b, sqrt(x))
# Section 8.4.20
# TODO this can be further simplified!
assert simplify(IMT(-2**(2*s)*cos(pi*a/2 - pi*b/2 + pi*s)*gamma(-2*s + 1) *
gamma(a/2 - b/2 + s)*gamma(a/2 + b/2 + s) /
(pi*gamma(a/2 - b/2 - s + 1)*gamma(a/2 + b/2 - s + 1)),
s, x,
(Max(-re(a)/2 - re(b)/2, -re(a)/2 + re(b)/2), S(1)/2))) == \
(cos(pi*b)*besselj(b, sqrt(x)) - besselj(-b, sqrt(x)))*besselj(a,
sqrt(x))/sin(pi*b)
# TODO more
# for coverage
assert IMT(pi / cos(pi * s), s, x, (0, S(1) / 2)) == sqrt(x) / (x + 1)
def test_sec():
x = symbols('x', real=True)
z = symbols('z')
assert sec.nargs == FiniteSet(1)
assert sec(0) == 1
assert sec(pi) == -1
assert sec(pi/2) == zoo
assert sec(-pi/2) == zoo
assert sec(pi/6) == 2*sqrt(3)/3
assert sec(pi/3) == 2
assert sec(5*pi/2) == zoo
assert sec(9*pi/7) == -sec(2*pi/7)
assert sec(3*pi/4) == -sqrt(2) # issue 8421
assert sec(I) == 1/cosh(1)
assert sec(x*I) == 1/cosh(x)
assert sec(-x) == sec(x)
assert sec(asec(x)) == x
assert sec(x).rewrite(exp) == 1/(exp(I*x)/2 + exp(-I*x)/2)
assert sec(x).rewrite(sin) == sec(x)
assert sec(x).rewrite(cos) == 1/cos(x)
assert sec(x).rewrite(tan) == (tan(x/2)**2 + 1)/(-tan(x/2)**2 + 1)
assert sec(x).rewrite(pow) == sec(x)
assert sec(x).rewrite(sqrt) == sec(x)
assert sec(z).rewrite(cot) == (cot(z/2)**2 + 1)/(cot(z/2)**2 - 1)
assert sec(z).conjugate() == sec(conjugate(z))
assert (sec(z).as_real_imag() ==
(cos(re(z))*cosh(im(z))/(sin(re(z))**2*sinh(im(z))**2 +
cos(re(z))**2*cosh(im(z))**2),
sin(re(z))*sinh(im(z))/(sin(re(z))**2*sinh(im(z))**2 +
cos(re(z))**2*cosh(im(z))**2)))
assert sec(x).expand(trig=True) == 1/cos(x)
assert sec(2*x).expand(trig=True) == 1/(2*cos(x)**2 - 1)
assert sec(x).is_real == True
assert sec(z).is_real == None
assert sec(a).is_algebraic is None
assert sec(na).is_algebraic is False
assert sec(x).as_leading_term() == sec(x)
assert sec(0).is_finite == True
assert sec(x).is_finite == None
assert sec(pi/2).is_finite == False
assert series(sec(x), x, x0=0, n=6) == 1 + x**2/2 + 5*x**4/24 + O(x**6)
# https://github.com/sympy/sympy/issues/7166
assert series(sqrt(sec(x))) == 1 + x**2/4 + 7*x**4/96 + O(x**6)
# https://github.com/sympy/sympy/issues/7167
assert (series(sqrt(sec(x)), x, x0=pi*3/2, n=4) ==
1/sqrt(x - 3*pi/2) + (x - 3*pi/2)**(S(3)/2)/12 +
(x - 3*pi/2)**(S(7)/2)/160 + O((x - 3*pi/2)**4, (x, 3*pi/2)))
assert sec(x).diff(x) == tan(x)*sec(x)
# Taylor Term checks
assert sec(z).taylor_term(4, z) == 5*z**4/24
assert sec(z).taylor_term(6, z) == 61*z**6/720
assert sec(z).taylor_term(5, z) == 0
def test_coth():
x, y = symbols('x,y')
k = Symbol('k', integer=True)
assert coth(nan) == nan
assert coth(zoo) == nan
assert coth(oo) == 1
assert coth(-oo) == -1
assert coth(0) == coth(0)
assert coth(0) == zoo
assert coth(1) == coth(1)
assert coth(-1) == -coth(1)
assert coth(x) == coth(x)
assert coth(-x) == -coth(x)
assert coth(pi * I) == -I * cot(pi)
assert coth(-pi * I) == cot(pi) * I
assert coth(2**1024 * E) == coth(2**1024 * E)
assert coth(-2**1024 * E) == -coth(2**1024 * E)
assert coth(pi * I) == -I * cot(pi)
assert coth(-pi * I) == I * cot(pi)
assert coth(2 * pi * I) == -I * cot(2 * pi)
assert coth(-2 * pi * I) == I * cot(2 * pi)
assert coth(-3 * 10**73 * pi * I) == I * cot(3 * 10**73 * pi)
assert coth(7 * 10**103 * pi * I) == -I * cot(7 * 10**103 * pi)
assert coth(pi * I / 2) == 0
assert coth(-pi * I / 2) == 0
assert coth(5 * pi * I / 2) == 0
assert coth(7 * pi * I / 2) == 0
assert coth(pi * I / 3) == -I / sqrt(3)
assert coth(-2 * pi * I / 3) == -I / sqrt(3)
assert coth(pi * I / 4) == -I
assert coth(-pi * I / 4) == I
assert coth(17 * pi * I / 4) == -I
assert coth(-3 * pi * I / 4) == -I
assert coth(pi * I / 6) == -sqrt(3) * I
assert coth(-pi * I / 6) == sqrt(3) * I
assert coth(7 * pi * I / 6) == -sqrt(3) * I
assert coth(-5 * pi * I / 6) == -sqrt(3) * I
assert coth(pi * I / 105) == -cot(pi / 105) * I
assert coth(-pi * I / 105) == cot(pi / 105) * I
assert coth(2 + 3 * I) == coth(2 + 3 * I)
assert coth(x * I) == -cot(x) * I
assert coth(k * pi * I) == -cot(k * pi) * I
assert coth(17 * k * pi * I) == -cot(17 * k * pi) * I
assert coth(k * pi * I) == -cot(k * pi) * I
sp.Pow(x, sp.Rational(1, n)) # Calcular la raiz n-esima
# Exponentes y logaritmos
sp.exp(num) # Calcular la exponencial
sp.log(num) # Calcular el logaritmo natural
sp.log(base, num) # Calcular el logaritmo en la base especificada
# Conversión de angulos
sp.deg(num) # Convertir ángulos de radianes a grados.
sp.rad(num) # Convertir ángulos de grados a radianes.
# Funciones para trigonometría (Angulos en radianes)
sp.sin(num) # Seno
sp.cos(num) # Coseno
sp.tan(num) # tangente
sp.cot(num) # cotangente
sp.sec(num) # secante
sp.csc(num) # cosecante
sp.asin(num) # Arcoseno
sp.acos(num) # Arcocoseno
sp.atan(num) # Arcotangente
sp.atan2(catetoY,
catetoX) # Arcotangente de un triangulo segun los catetos (Angulo)
sp.acot(num) # Arcocotangente
sp.asec(num) # Arcosecante
sp.acsc(num) # Arcocosecante
# Funciones hiperbólicas (Angulos en radianes)
sp.sinh(num) # Seno
sp.cosh(num) # Coseno
sp.tanh(num) # tangente
def test_issue_4547():
assert limit(cot(x), x, 0, dir='+') is oo
assert limit(cot(x), x, pi / 2, dir='+') == 0
def test_issue1448():
assert sin(x).rewrite(cot) == 2 * cot(x / 2) / (1 + cot(x / 2)**2)
assert cos(x).rewrite(cot) == -(1 - cot(x / 2)**2) / (1 + cot(x / 2)**2)
assert tan(x).rewrite(cot) == 1 / cot(x)
assert cot(x).fdiff() == -1 - cot(x)**2
def test_cot_expansion():
assert cot(x + y).expand(trig=True) == ((cot(x) * cot(y) - 1) /
(cot(x) + cot(y))).expand()
assert cot(x - y).expand(trig=True) == (-(cot(x) * cot(y) + 1) /
(cot(x) - cot(y))).expand()
assert cot(x + y + z).expand(trig=True) == (
(cot(x) * cot(y) * cot(z) - cot(x) - cot(y) - cot(z)) /
(-1 + cot(x) * cot(y) + cot(x) * cot(z) + cot(y) * cot(z))).expand()
assert cot(3 * x).expand(trig=True) == ((cot(x)**3 - 3 * cot(x)) /
(3 * cot(x)**2 - 1)).expand()
assert 0 == cot(2 * x).expand(trig=True).rewrite(cot).subs(
[(cot(x), Rational(1, 3))]) * 3 + 4
assert 0 == cot(3 * x).expand(trig=True).rewrite(cot).subs(
[(cot(x), Rational(1, 5))]) * 55 - 37
assert 0 == cot(4 * x - pi / 4).expand(trig=True).rewrite(cot).subs(
[(cot(x), Rational(1, 7))]) * 863 + 191
def test_trig_symmetry():
assert sin(-x) == -sin(x)
assert cos(-x) == cos(x)
assert tan(-x) == -tan(x)
assert cot(-x) == -cot(x)
assert sin(x + pi) == -sin(x)
assert sin(x + 2 * pi) == sin(x)
assert sin(x + 3 * pi) == -sin(x)
assert sin(x + 4 * pi) == sin(x)
assert sin(x - 5 * pi) == -sin(x)
assert cos(x + pi) == -cos(x)
assert cos(x + 2 * pi) == cos(x)
assert cos(x + 3 * pi) == -cos(x)
assert cos(x + 4 * pi) == cos(x)
assert cos(x - 5 * pi) == -cos(x)
assert tan(x + pi) == tan(x)
assert tan(x - 3 * pi) == tan(x)
assert cot(x + pi) == cot(x)
assert cot(x - 3 * pi) == cot(x)
assert sin(pi / 2 - x) == cos(x)
assert sin(3 * pi / 2 - x) == -cos(x)
assert sin(5 * pi / 2 - x) == cos(x)
assert cos(pi / 2 - x) == sin(x)
assert cos(3 * pi / 2 - x) == -sin(x)
assert cos(5 * pi / 2 - x) == sin(x)
assert tan(pi / 2 - x) == cot(x)
assert tan(3 * pi / 2 - x) == cot(x)
assert tan(5 * pi / 2 - x) == cot(x)
assert cot(pi / 2 - x) == tan(x)
assert cot(3 * pi / 2 - x) == tan(x)
assert cot(5 * pi / 2 - x) == tan(x)
assert sin(pi / 2 + x) == cos(x)
assert cos(pi / 2 + x) == -sin(x)
assert tan(pi / 2 + x) == -cot(x)
assert cot(pi / 2 + x) == -tan(x)
def test_basic1():
assert limit(x, x, oo) is oo
assert limit(x, x, -oo) is -oo
assert limit(-x, x, oo) is -oo
assert limit(x**2, x, -oo) is oo
assert limit(-x**2, x, oo) is -oo
assert limit(x * log(x), x, 0, dir="+") == 0
assert limit(1 / x, x, oo) == 0
assert limit(exp(x), x, oo) is oo
assert limit(-exp(x), x, oo) is -oo
assert limit(exp(x) / x, x, oo) is oo
assert limit(1 / x - exp(-x), x, oo) == 0
assert limit(x + 1 / x, x, oo) is oo
assert limit(x - x**2, x, oo) is -oo
assert limit((1 + x)**(1 + sqrt(2)), x, 0) == 1
assert limit((1 + x)**oo, x, 0) == Limit((x + 1)**oo, x, 0)
assert limit((1 + x)**oo, x, 0, dir='-') == Limit((x + 1)**oo,
x,
0,
dir='-')
assert limit((1 + x + y)**oo, x, 0, dir='-') == Limit((x + y + 1)**oo,
x,
0,
dir='-')
assert limit(y / x / log(x), x, 0) == -oo * sign(y)
assert limit(cos(x + y) / x, x, 0) == sign(cos(y)) * oo
assert limit(gamma(1 / x + 3), x, oo) == 2
assert limit(S.NaN, x, -oo) is S.NaN
assert limit(Order(2) * x, x, S.NaN) is S.NaN
assert limit(1 / (x - 1), x, 1, dir="+") is oo
assert limit(1 / (x - 1), x, 1, dir="-") is -oo
assert limit(1 / (5 - x)**3, x, 5, dir="+") is -oo
assert limit(1 / (5 - x)**3, x, 5, dir="-") is oo
assert limit(1 / sin(x), x, pi, dir="+") is -oo
assert limit(1 / sin(x), x, pi, dir="-") is oo
assert limit(1 / cos(x), x, pi / 2, dir="+") is -oo
assert limit(1 / cos(x), x, pi / 2, dir="-") is oo
assert limit(1 / tan(x**3), x, (2 * pi)**Rational(1, 3), dir="+") is oo
assert limit(1 / tan(x**3), x, (2 * pi)**Rational(1, 3), dir="-") is -oo
assert limit(1 / cot(x)**3, x, (pi * Rational(3, 2)), dir="+") is -oo
assert limit(1 / cot(x)**3, x, (pi * Rational(3, 2)), dir="-") is oo
# test bi-directional limits
assert limit(sin(x) / x, x, 0, dir="+-") == 1
assert limit(x**2, x, 0, dir="+-") == 0
assert limit(1 / x**2, x, 0, dir="+-") is oo
# test failing bi-directional limits
assert limit(1 / x, x, 0, dir="+-") is zoo
# approaching 0
# from dir="+"
assert limit(1 + 1 / x, x, 0) is oo
# from dir='-'
# Add
assert limit(1 + 1 / x, x, 0, dir='-') is -oo
# Pow
assert limit(x**(-2), x, 0, dir='-') is oo
assert limit(x**(-3), x, 0, dir='-') is -oo
assert limit(1 / sqrt(x), x, 0, dir='-') == (-oo) * I
assert limit(x**2, x, 0, dir='-') == 0
assert limit(sqrt(x), x, 0, dir='-') == 0
assert limit(x**-pi, x, 0, dir='-') == oo * sign((-1)**(-pi))
assert limit((1 + cos(x))**oo, x, 0) == Limit((cos(x) + 1)**oo, x, 0)
(1 + sympy.tan(b * symbol)**2)**
(n / 2 - 1) * sympy.sec(b * symbol)**2 * sympy.tan(a * symbol)**m))
tansec_tanodd_condition = uncurry(lambda a, b, m, n, i, s: m.is_odd)
tansec_tanodd = trig_rewriter(
lambda a, b, m, n, i, symbol: ((sympy.sec(a * symbol)**2 - 1)**(
(m - 1) / 2) * sympy.tan(a * symbol) * sympy.sec(b * symbol)**n))
tan_tansquared_condition = uncurry(lambda a, b, m, n, i, s: m == 2 and n == 0)
tan_tansquared = trig_rewriter(lambda a, b, m, n, i, symbol:
(sympy.sec(a * symbol)**2 - 1))
cotcsc_csceven_condition = uncurry(
lambda a, b, m, n, i, s: n.is_even and n >= 4)
cotcsc_csceven = trig_rewriter(lambda a, b, m, n, i, symbol: (
(1 + sympy.cot(b * symbol)**2)**
(n / 2 - 1) * sympy.csc(b * symbol)**2 * sympy.cot(a * symbol)**m))
cotcsc_cotodd_condition = uncurry(lambda a, b, m, n, i, s: m.is_odd)
cotcsc_cotodd = trig_rewriter(
lambda a, b, m, n, i, symbol: ((sympy.csc(a * symbol)**2 - 1)**(
(m - 1) / 2) * sympy.cot(a * symbol) * sympy.csc(b * symbol)**n))
def trig_sincos_rule(integral):
integrand, symbol = integral
if any(integrand.has(f) for f in (sympy.sin, sympy.cos)):
pattern, a, b, m, n = sincos_pattern(symbol)
match = integrand.match(pattern)
def test_issue1448():
assert limit(cot(x), x, 0, dir='+') == oo
assert limit(cot(x), x, pi / 2, dir='+') == 0
def test_coth():
x, y = symbols('x,y')
k = Symbol('k', integer=True)
assert coth(nan) is nan
assert coth(zoo) is nan
assert coth(oo) == 1
assert coth(-oo) == -1
assert coth(0) is zoo
assert unchanged(coth, 1)
assert coth(-1) == -coth(1)
assert unchanged(coth, x)
assert coth(-x) == -coth(x)
assert coth(pi*I) == -I*cot(pi)
assert coth(-pi*I) == cot(pi)*I
assert unchanged(coth, 2**1024 * E)
assert coth(-2**1024 * E) == -coth(2**1024 * E)
assert coth(pi*I) == -I*cot(pi)
assert coth(-pi*I) == I*cot(pi)
assert coth(2*pi*I) == -I*cot(2*pi)
assert coth(-2*pi*I) == I*cot(2*pi)
assert coth(-3*10**73*pi*I) == I*cot(3*10**73*pi)
assert coth(7*10**103*pi*I) == -I*cot(7*10**103*pi)
assert coth(pi*I/2) == 0
assert coth(-pi*I/2) == 0
assert coth(pi*I*Rational(5, 2)) == 0
assert coth(pi*I*Rational(7, 2)) == 0
assert coth(pi*I/3) == -I/sqrt(3)
assert coth(pi*I*Rational(-2, 3)) == -I/sqrt(3)
assert coth(pi*I/4) == -I
assert coth(-pi*I/4) == I
assert coth(pi*I*Rational(17, 4)) == -I
assert coth(pi*I*Rational(-3, 4)) == -I
assert coth(pi*I/6) == -sqrt(3)*I
assert coth(-pi*I/6) == sqrt(3)*I
assert coth(pi*I*Rational(7, 6)) == -sqrt(3)*I
assert coth(pi*I*Rational(-5, 6)) == -sqrt(3)*I
assert coth(pi*I/105) == -cot(pi/105)*I
assert coth(-pi*I/105) == cot(pi/105)*I
assert unchanged(coth, 2 + 3*I)
assert coth(x*I) == -cot(x)*I
assert coth(k*pi*I) == -cot(k*pi)*I
assert coth(17*k*pi*I) == -cot(17*k*pi)*I
assert coth(k*pi*I) == -cot(k*pi)*I
assert coth(log(tan(2))) == coth(log(-tan(2)))
assert coth(1 + I*pi/2) == tanh(1)
assert coth(x).as_real_imag(deep=False) == (sinh(re(x))*cosh(re(x))/(sin(im(x))**2
+ sinh(re(x))**2),
-sin(im(x))*cos(im(x))/(sin(im(x))**2 + sinh(re(x))**2))
x = Symbol('x', extended_real=True)
assert coth(x).as_real_imag(deep=False) == (coth(x), 0)
def test_cot():
assert cot(nan) == nan
assert cot(oo * I) == -I
assert cot(-oo * I) == I
assert cot(0) == zoo
assert cot(2 * pi) == zoo
assert cot(acot(x)) == x
assert cot(atan(x)) == 1 / x
assert cot(asin(x)) == sqrt(1 - x**2) / x
assert cot(acos(x)) == x / sqrt(1 - x**2)
assert cot(atan2(y, x)) == x / y
assert cot(pi * I) == -coth(pi) * I
assert cot(-pi * I) == coth(pi) * I
assert cot(-2 * I) == coth(2) * I
assert cot(pi) == cot(2 * pi) == cot(3 * pi)
assert cot(-pi) == cot(-2 * pi) == cot(-3 * pi)
assert cot(pi / 2) == 0
assert cot(-pi / 2) == 0
assert cot(5 * pi / 2) == 0
assert cot(7 * pi / 2) == 0
assert cot(pi / 3) == 1 / sqrt(3)
assert cot(-2 * pi / 3) == 1 / sqrt(3)
assert cot(pi / 4) == S.One
assert cot(-pi / 4) == -S.One
assert cot(17 * pi / 4) == S.One
assert cot(-3 * pi / 4) == S.One
assert cot(pi / 6) == sqrt(3)
assert cot(-pi / 6) == -sqrt(3)
assert cot(7 * pi / 6) == sqrt(3)
assert cot(-5 * pi / 6) == sqrt(3)
assert cot(x * I) == -coth(x) * I
assert cot(k * pi * I) == -coth(k * pi) * I
assert cot(r).is_real is True
assert cot(10 * pi / 7) == cot(3 * pi / 7)
assert cot(11 * pi / 7) == -cot(3 * pi / 7)
assert cot(-11 * pi / 7) == cot(3 * pi / 7)
def test_cot_series():
assert cot(x).series(x, 0, 9) == \
1/x - x/3 - x**3/45 - 2*x**5/945 - x**7/4725 + O(x**9)
# issue 6210
assert cot(x**4 + x**5).series(x, 0, 1) == \
x**(-4) - 1/x**3 + x**(-2) - 1/x + 1 + O(x)
def test_sin_rewrite():
x = Symbol('x')
assert sin(x).rewrite(exp) == -I * (exp(I * x) - exp(-I * x)) / 2
assert sin(x).rewrite(tan) == 2 * tan(x / 2) / (1 + tan(x / 2)**2)
assert sin(x).rewrite(cot) == 2 * cot(x / 2) / (1 + cot(x / 2)**2)
def test_csc():
x = symbols('x', real=True)
z = symbols('z')
# https://github.com/sympy/sympy/issues/6707
cosecant = csc('x')
alternate = 1 / sin('x')
assert cosecant.equals(alternate) == True
assert alternate.equals(cosecant) == True
assert csc.nargs == FiniteSet(1)
assert csc(0) == zoo
assert csc(pi) == zoo
assert csc(pi / 2) == 1
assert csc(-pi / 2) == -1
assert csc(pi / 6) == 2
assert csc(pi / 3) == 2 * sqrt(3) / 3
assert csc(5 * pi / 2) == 1
assert csc(9 * pi / 7) == -csc(2 * pi / 7)
assert csc(3 * pi / 4) == sqrt(2) # issue 8421
assert csc(I) == -I / sinh(1)
assert csc(x * I) == -I / sinh(x)
assert csc(-x) == -csc(x)
assert csc(acsc(x)) == x
assert csc(x).rewrite(exp) == 2 * I / (exp(I * x) - exp(-I * x))
assert csc(x).rewrite(sin) == 1 / sin(x)
assert csc(x).rewrite(cos) == csc(x)
assert csc(x).rewrite(tan) == (tan(x / 2)**2 + 1) / (2 * tan(x / 2))
assert csc(x).rewrite(cot) == (cot(x / 2)**2 + 1) / (2 * cot(x / 2))
assert csc(z).conjugate() == csc(conjugate(z))
assert (csc(z).as_real_imag() == (
sin(re(z)) * cosh(im(z)) /
(sin(re(z))**2 * cosh(im(z))**2 + cos(re(z))**2 * sinh(im(z))**2),
-cos(re(z)) * sinh(im(z)) /
(sin(re(z))**2 * cosh(im(z))**2 + cos(re(z))**2 * sinh(im(z))**2)))
assert csc(x).expand(trig=True) == 1 / sin(x)
assert csc(2 * x).expand(trig=True) == 1 / (2 * sin(x) * cos(x))
assert csc(x).is_real == True
assert csc(z).is_real == None
assert csc(a).is_algebraic is None
assert csc(na).is_algebraic is False
assert csc(x).as_leading_term() == csc(x)
assert csc(0).is_finite == False
assert csc(x).is_finite == None
assert csc(pi / 2).is_finite == True
assert series(csc(x), x, x0=pi/2, n=6) == \
1 + (x - pi/2)**2/2 + 5*(x - pi/2)**4/24 + O((x - pi/2)**6, (x, pi/2))
assert series(csc(x), x, x0=0, n=6) == \
1/x + x/6 + 7*x**3/360 + 31*x**5/15120 + O(x**6)
assert csc(x).diff(x) == -cot(x) * csc(x)
assert csc(x).taylor_term(2, x) == 0
assert csc(x).taylor_term(3, x) == 7 * x**3 / 360
assert csc(x).taylor_term(5, x) == 31 * x**5 / 15120
def test_csc():
assert csc(x).diff(x) == -cot(x) * csc(x)
def base_shape():
pyramid_base_shape = ''
while True:
try:
pyramid_base_shape = int (input(
'\nDoes the base of the pyramid have even sides (press 1), is it a rectangle (press 2) or an '
'isocelies triangle (press 3): ').upper())
except ValueError:
print('Invalid input. Try again')
if pyramid_base_shape == 1:
while True:
try:
pyramid_num_sides = int(input('\nHow many sides does the pyramid have?: '))
pyramid_side_length = float(input('Enter the side length: '))
pyramid_height = float(input('Enter the height of the pyramid: '))
pyramid_vol = (pyramid_num_sides / 12) * pyramid_height * pyramid_side_length ** 2 * sympy.cot(
math.pi / pyramid_num_sides)
print(f'\nThe volume of the pyramid is {pyramid_vol.__round__(2)} cu')
math_sheet()
except ValueError:
print('Invalid input. Try again')
elif pyramid_base_shape == 2:
while True:
try:
base_len = int(input('Enter the length of the base: '))
base_width = int(input('Enter the width of the base: '))
area_of_base = base_len * base_width
height = (int(input('Enter the height of the pyramid: ')))
vol_pyramid = (area_of_base * height) / 3
print(f'\nThe volume of the pyramid is {vol_pyramid.__round__(2)}²')
math_sheet()
except ValueError:
print('Invalid input. Try again.')
elif pyramid_base_shape == 3:
while True:
try:
base_len = int(input('\nEnter the length of one long side of the triangle base: '))
base_width = int(input('Enter the length of one short side of the triangle base: '))
area_of_base = (base_len * base_width) / 2
height = (int(input('Enter the height of the pyramid: ')))
vol_pyramid = (area_of_base * height) / 3
print(f'\nThe volume of the pyramid is {vol_pyramid.__round__(2)} cu')
math_sheet()
except ValueError:
print('Invalid input. Try again.')
def test_cot_rewrite():
neg_exp, pos_exp = exp(-x * I), exp(x * I)
assert cot(x).rewrite(exp) == I * (pos_exp + neg_exp) / (pos_exp - neg_exp)
assert cot(x).rewrite(sin) == 2 * sin(2 * x) / sin(x)**2
assert cot(x).rewrite(cos) == -cos(x) / cos(x + S.Pi / 2)
assert cot(x).rewrite(tan) == 1 / tan(x)
assert cot(sinh(x)).rewrite(exp).subs(x,
3).n() == cot(x).rewrite(exp).subs(
x, sinh(3)).n()
assert cot(cosh(x)).rewrite(exp).subs(x,
3).n() == cot(x).rewrite(exp).subs(
x, cosh(3)).n()
assert cot(tanh(x)).rewrite(exp).subs(x,
3).n() == cot(x).rewrite(exp).subs(
x, tanh(3)).n()
assert cot(coth(x)).rewrite(exp).subs(x,
3).n() == cot(x).rewrite(exp).subs(
x, coth(3)).n()
assert cot(sin(x)).rewrite(exp).subs(x, 3).n() == cot(x).rewrite(exp).subs(
x, sin(3)).n()
assert cot(tan(x)).rewrite(exp).subs(x, 3).n() == cot(x).rewrite(exp).subs(
x, tan(3)).n()
assert cot(log(x)).rewrite(Pow) == -I * (x**-I + x**I) / (x**-I - x**I)
assert cot(4 * pi / 15).rewrite(pow) == (cos(4 * pi / 15) /
sin(4 * pi / 15)).rewrite(pow)
assert cot(pi / 19).rewrite(pow) == cot(pi / 19)
assert cot(pi / 19).rewrite(sqrt) == cot(pi / 19)
def test_issue1230():
assert tan(x).series(x, pi/2, n=3).removeO().subs(x, x - pi/2) == \
-pi/6 + x/3 - 1/(x - pi/2)
assert cot(x).series(x, pi, n=3).removeO().subs(x, x - pi) == \
-x/3 + pi/3 + 1/(x - pi)
assert limit(tan(x)**tan(2*x), x, pi/4) == exp(-1)
def test_TR15_16_17():
assert TR15(1 - 1 / sin(x)**2) == -cot(x)**2
assert TR16(1 - 1 / cos(x)**2) == -tan(x)**2
assert TR111(1 - 1 / tan(x)**2) == 1 - cot(x)**2
def test_issue_1321():
i = Symbol('i', integer=True)
e = Symbol('e', even=True)
o = Symbol('o', odd=True)
# unknown parity for variable
assert cos(4 * i * pi) == 1
assert sin(4 * i * pi) == 0
assert tan(4 * i * pi) == 0
assert cot(4 * i * pi) == zoo
assert cos(3 * i * pi) == cos(pi * i) # +/-1
assert sin(3 * i * pi) == 0
assert tan(3 * i * pi) == 0
assert cot(3 * i * pi) == zoo
assert cos(4.0 * i * pi) == 1
assert sin(4.0 * i * pi) == 0
assert tan(4.0 * i * pi) == 0
assert cot(4.0 * i * pi) == zoo
assert cos(3.0 * i * pi) == cos(pi * i) # +/-1
assert sin(3.0 * i * pi) == 0
assert tan(3.0 * i * pi) == 0
assert cot(3.0 * i * pi) == zoo
assert cos(4.5 * i * pi) == cos(0.5 * pi * i)
assert sin(4.5 * i * pi) == sin(0.5 * pi * i)
assert tan(4.5 * i * pi) == tan(0.5 * pi * i)
assert cot(4.5 * i * pi) == cot(0.5 * pi * i)
# parity of variable is known
assert cos(4 * e * pi) == 1
assert sin(4 * e * pi) == 0
assert tan(4 * e * pi) == 0
assert cot(4 * e * pi) == zoo
assert cos(3 * e * pi) == 1
assert sin(3 * e * pi) == 0
assert tan(3 * e * pi) == 0
assert cot(3 * e * pi) == zoo
assert cos(4.0 * e * pi) == 1
assert sin(4.0 * e * pi) == 0
assert tan(4.0 * e * pi) == 0
assert cot(4.0 * e * pi) == zoo
assert cos(3.0 * e * pi) == 1
assert sin(3.0 * e * pi) == 0
assert tan(3.0 * e * pi) == 0
assert cot(3.0 * e * pi) == zoo
assert cos(4.5 * e * pi) == cos(0.5 * pi * e)
assert sin(4.5 * e * pi) == sin(0.5 * pi * e)
assert tan(4.5 * e * pi) == tan(0.5 * pi * e)
assert cot(4.5 * e * pi) == cot(0.5 * pi * e)
assert cos(4 * o * pi) == 1
assert sin(4 * o * pi) == 0
assert tan(4 * o * pi) == 0
assert cot(4 * o * pi) == zoo
assert cos(3 * o * pi) == -1
assert sin(3 * o * pi) == 0
assert tan(3 * o * pi) == 0
assert cot(3 * o * pi) == zoo
assert cos(4.0 * o * pi) == 1
assert sin(4.0 * o * pi) == 0
assert tan(4.0 * o * pi) == 0
assert cot(4.0 * o * pi) == zoo
assert cos(3.0 * o * pi) == -1
assert sin(3.0 * o * pi) == 0
assert tan(3.0 * o * pi) == 0
assert cot(3.0 * o * pi) == zoo
assert cos(4.5 * o * pi) == cos(0.5 * pi * o)
assert sin(4.5 * o * pi) == sin(0.5 * pi * o)
assert tan(4.5 * o * pi) == tan(0.5 * pi * o)
assert cot(4.5 * o * pi) == cot(0.5 * pi * o)
# x could be imaginary
assert cos(4 * x * pi) == cos(4 * pi * x)
assert sin(4 * x * pi) == sin(4 * pi * x)
assert tan(4 * x * pi) == tan(4 * pi * x)
assert cot(4 * x * pi) == cot(4 * pi * x)
assert cos(3 * x * pi) == cos(3 * pi * x)
assert sin(3 * x * pi) == sin(3 * pi * x)
assert tan(3 * x * pi) == tan(3 * pi * x)
assert cot(3 * x * pi) == cot(3 * pi * x)
assert cos(4.0 * x * pi) == cos(4.0 * pi * x)
assert sin(4.0 * x * pi) == sin(4.0 * pi * x)
assert tan(4.0 * x * pi) == tan(4.0 * pi * x)
assert cot(4.0 * x * pi) == cot(4.0 * pi * x)
assert cos(3.0 * x * pi) == cos(3.0 * pi * x)
assert sin(3.0 * x * pi) == sin(3.0 * pi * x)
assert tan(3.0 * x * pi) == tan(3.0 * pi * x)
assert cot(3.0 * x * pi) == cot(3.0 * pi * x)
assert cos(4.5 * x * pi) == cos(4.5 * pi * x)
assert sin(4.5 * x * pi) == sin(4.5 * pi * x)
assert tan(4.5 * x * pi) == tan(4.5 * pi * x)
assert cot(4.5 * x * pi) == cot(4.5 * pi * x)
def test_newissue():
assert limit(exp(1 / sin(x)) / exp(cot(x)), x, 0) == 1
