Updates:
Status: Fixed
Labels: -NeedsReview PassedReview
Comment #9 on issue 1355 by matt...@gmail.com:
factor(expand((sin(x)+sin(y))*(cos(x)+cos(y)))) fails
http://code.google.com/p/sympy/issues/detail?id=1355
This is really a duplicate, works now, e.g.:
In [1]: e = (sin(x)+sin(y))*(cos(x)+cos(y))
In [2]: expand(e)
Out[2]: cos(x)⋅sin(x) + cos(x)⋅sin(y) + cos(y)⋅sin(x) + cos(y)⋅sin(y)
In [3]: factor(_)
Out[3]: (cos(x) + cos(y))⋅(sin(x) + sin(y))
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