Updates:
Status: Started
Blockedon: 1620
Comment #18 on issue 1525 by asmeurer: No integration by substitution
http://code.google.com/p/sympy/issues/detail?id=1525
Well, I think the easiest way to fix this will be to make Derivative(f(x),
g(x)) raise an error. Unfortunately, this also makes things like
f(2*x).diff(x) return an error. But what that used to return
(2*Derivative(f(2*x), 2*x)) was incorrect anyway (the correct answer
involves the derivative of f evaluated at the point 2*x).
This works fine, except it breaks the homogeneous order ode docstrings.
I'm currently in the process of seeing how to fix that.
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