Updates:
Status: Started
Cc: Vinzent.Steinberg
Comment #5 on issue 1660 by asmeurer: [PATCH] derivatives of composed
functions should not evaluate to a derivative in terms of a function
http://code.google.com/p/sympy/issues/detail?id=1660
Like Ondrej said, the ideal solution would involve point evaluation with
issue 1620, so we could say diff(f(g(x)),
x) == g'(x)*f'(g(x)).
We should somehow keep these tests that this patch removes and re-add them
when 1620 is fixed. Some of
them could actually just be rewritten and kept.
I am +1 on the fix part, but not sure about the removed tests for now.
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