Comment #11 on issue 2949 by [email protected]: trig functions do not return exact results for half angles
http://code.google.com/p/sympy/issues/detail?id=2949
I think sin(oo) used to return nan but now just remains unevaluated. That test can be removed.
For simplification, try radsimp() and sqrtdenest(). Those may not be enough, though, depending on how complicated they are.
Any chance you could submit this as a pull request? That would make it much easier to review. See github.com/sympy/sympy/wiki/development-workflow.
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