def test_sin_reverse(self):
x = FADiff()
x.set_mode('reverse')
x = x.new_scal(3)
a = Elems.sin(x)
assert a.val == pytest.approx(0.1411200080598672)
assert a.der == pytest.approx(-0.9899924966004454)
y = 2
assert Elems.sin(y) == np.sin(y)
f'{x.der}') # derivatives for input vars used in calculation
print(f'y.val --> '
f'{y.val}') # Should be [5]
print(f'y._der --> ' # '_der' is a dictionary containing the
f'{y._der}') # partial derivatives for a var
print(f'y.der --> '
f'{y.der}') # Should be [1]
print(f'z.val --> '
f'{z.val}') # Should be [3]
print(f'z._der --> ' # '_der' is a dictionary containing the
f'{z._der}') # partial derivatives for a var
print(f'z.der --> '
f'{z.der}') # Should be [1]
print(f'\ncheck = x * y + ef.sin(x)')
check = x * y + ef.sin(x)
print(f'check.val --> '
f'{check.val}') # Should be [10.909...]
print(f'check.der --> '
f'{check.der}') # Should be [4.583..., 2]
print(f'check._der.get(x) --> '
f'{check._der.get(x)}') # Should be 4.583...
print(f'check._der.get(y) --> '
f'{check._der.get(y)}') # Should be 2
print(f'\ncheck = ef.sin(x + y)')
check = ef.sin(x + y)
print(f'check.val --> '
f'{check.val}') # Should be [0.656...]
print(f'check.der --> '
f'{check.der}')