Comment #38 on issue 694 by [email protected]: Add tests from "Review of CAS mathematical capabilities", by Michael Wester
http://code.google.com/p/sympy/issues/detail?id=694

That is because in the first case it can factor sin(x) - sin(x)/cos(x) as sin(x)*(1 - 1/cos(x)) == sin(x)*(cos(x) - 1)/cos(x), and the solve sin(x) = 0 and cos(x) - 1 = 0, but in the second case, it cannot symbolically factor the expression.

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