Comment #6 on issue 1857 by smi...@gmail.com: evalf/simplify accuracy http://code.google.com/p/sympy/issues/detail?id=1857
By using factor_terms, the expression in comment 5 is seen to be identically zero. Numerical evaluation should really be working better. Is there any reason not to use factor_terms to try tidy up expressions before beginning the evaluation work?
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