Updates:
        Status: Fixed
        Labels: -NeedsReview PassedReview

Comment #6 on issue 2054 by [email protected]: 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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