Comment #7 on issue 1525 by asmeurer: No integration by substitution
http://code.google.com/p/sympy/issues/detail?id=1525
It turns out that 2361dd86df3757939dfd9fcb5e39888465e2dfc3 is exactly the
commit where we stopped having
In [1]: integrate(f(2*x), x)
Out[1]:
⌠
⎮ f(2⋅x) dx
⌡
and started getting
In [1]: integrate(f(2*x), x)
---------------------------------------------------------------------------
ValueError: Derivative expects Symbol [, Integer] args but got 2*x, 1
which is understandable. I'm not saying this means we should decide
against it, but it's something to consider. Definitely if we decide to
keep it and don't fix issue 1620 yet, integrate() should be fixed to handle
that better.
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