Updates:
        Status: Invalid

Comment #2 on issue 2748 by [email protected]: your docs, derivative of tan(x) != tan^2(x)
http://code.google.com/p/sympy/issues/detail?id=2748

Yes, we compute the derivative of tan(x) as 1 + tan(x)**2 because the integration algorithm requires the derivatives of functions to be written in terms of themselves.

By the way, in the future, please point out specifically where in the docs you think the problem is.

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