Comment #2 on issue 1368 by asmeurer: solve((a**2 + 1) * (sin(a*x) + cos(a*x)), x) fails
http://code.google.com/p/sympy/issues/detail?id=1368
I think it is zero. cos(I*x) == cosh(x) and sin(I*x) == sinh(x). If you do this, replace it with the exp definitions, and reduce the logs, you will find that everything cancels. Maybe we should expand .rewrite() to handle this conversion.
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