test_simplify.py 文件源码

def test_simplify_other():
    assert simplify(sin(x)**2 + cos(x)**2) == 1
    assert simplify(gamma(x + 1)/gamma(x)) == x
    assert simplify(sin(x)**2 + cos(x)**2 + factorial(x)/gamma(x)) == 1 + x
    assert simplify(
        Eq(sin(x)**2 + cos(x)**2, factorial(x)/gamma(x))) == Eq(1, x)
    nc = symbols('nc', commutative=False)
    assert simplify(x + x*nc) == x*(1 + nc)
    # issue 6123
    # f = exp(-I*(k*sqrt(t) + x/(2*sqrt(t)))**2)
    # ans = integrate(f, (k, -oo, oo), conds='none')
    ans = I*(-pi*x*exp(-3*I*pi/4 + I*x**2/(4*t))*erf(x*exp(-3*I*pi/4)/
        (2*sqrt(t)))/(2*sqrt(t)) + pi*x*exp(-3*I*pi/4 + I*x**2/(4*t))/
        (2*sqrt(t)))*exp(-I*x**2/(4*t))/(sqrt(pi)*x) - I*sqrt(pi) * \
        (-erf(x*exp(I*pi/4)/(2*sqrt(t))) + 1)*exp(I*pi/4)/(2*sqrt(t))
    assert simplify(ans) == -(-1)**(S(3)/4)*sqrt(pi)/sqrt(t)
    # issue 6370
    assert simplify(2**(2 + x)/4) == 2**x