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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