Updates:
Status: a
Comment #1 on issue 3403 by [email protected]: 'Mul' object has no
attribute '_eval_expand_trig'
http://code.google.com/p/sympy/issues/detail?id=3403
As I noted on the mailing list, it's because it assumes it can recursively
expand sin(-y), but that is automatically transformed to -sin(y). So the
code needs to be a little smarter.
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