Updates:
Status: Fixed
Labels: -NeedsReview PassedReview
Comment #6 on issue 2054 by matt...@gmail.com: does factor need to use
cancel?
http://code.google.com/p/sympy/issues/detail?id=2054
Now in master:
In [1]: ee = I*(exp(I*x) - exp(-I*x))/(exp(I*x) + exp(-I*x)) -
I*(exp(I*x)/2 - exp(-I*x)/2)/(exp(I*x)/2 + exp(-I*x)/2)
In [2]: factor(ee.diff(x))
Out[2]: 0
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