Updates:
Status: Fixed
Comment #10 on issue 1660 by renato.c...@gmail.com: [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
This has been fixed in 89adffcd. Now g(f(x)).diff(x) returns D(f(x),
x)*Subs(D(g(_1), _1), Tuple(_1), Tuple(f(x))).
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