Updates:
Cc: -mattpap
Labels: Integration
Comment #6 on issue 1201 by asmeurer: "better" tan(x**2).diff(x)
http://code.google.com/p/sympy/issues/detail?id=1201
I think functions like tan(x) should have tan(x).diff(x) return sec(x)**2
or cos(x)**-2, and have a special ._risch_diff() method that gives the
tan(x)**2 + 1 derivative that the Risch algorithm wants (by the way, it
basically wants derivatives that are polynomials (or in the case of
heurisch, rational functions) in the original function).
What do others think?
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