Comment #13 on issue 1525 by smi...@gmail.com: No integration by substitution
http://code.google.com/p/sympy/issues/detail?id=1525
That--saying that x is free--is perhaps incorrect. Does it matter what you put in for x? Can you give an example where f(x).diff(x) would be different thatn f(y).diff(y)? I can't imagine any difference, but an example could be enlightening.
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