Comment #16 on issue 2151 by asmeurer: BasicMeta.keep_sign http://code.google.com/p/sympy/issues/detail?id=2151
Yeah, it just differs by a minus sign. If checkodesol() reduces it to zero, then it should be correct.
Trigonometric expressions not simplifying all the way is kind of expected, and probably could just be XFAILed. We need to improve simplify() to intelligently handle trigonometric expressions.
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