Updates:
Labels: WrongResult
Comment #3 on issue 1525 by asmeurer: No integration by substitution
http://code.google.com/p/sympy/issues/detail?id=1525
Well, something really wacky is happening now:
In [2]: integrate(f(2*x), x)
Out[2]:
2
f (2⋅x)
──────────
d
4⋅──(f(u))
du
In [3]: integrate(f(2*x), x).diff(x)
Out[3]:
d
──(f(u))⋅f(2⋅x)
du
───────────────
d
──(f(u))
du
Where the heck did u come from?! And why won't it cancel?
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