def test_ADmath_arcsinr():
f = ADmath.arcsin(.2)
assert f == np.arcsin(.2)
def test_ADmath_arcsin():
f = ADmath.arcsin(ADnum(.2, der=1))
assert f.val == np.arcsin(.2)
assert f.der == 1 / (np.sqrt(1 - .2**2))
assert len(f.graph) == 1