sympy/sympy — pull request #1909 by cheatiiit (2013-03-20 00:25:53+00:00)
Title: Implemented risch_integrate for trigonometric, inverse trigonometric and hyperbolic functions

Earlier
>>risch_integrate(tan(x)+log(x),x)
raised NonImplementedError
Now
>>risch_integrate(tan(x)+log(x),x)
⎛ 2⋅ⅈ⋅x ⎞
x⋅log(x) + x⋅(-1 + ⅈ) - log⎝ℯ + 1⎠