Comment #27 on issue 1525 by renato.c...@gmail.com: No integration by
substitution
http://code.google.com/p/sympy/issues/detail?id=1525
The pull request above is in, and issue 1620 is fixed. Is there something
to do in this issue? BTW, this is what I think the OP meant in the first
place:
⎛u ⎞│
⎜⌠ ⎟│
⎜⎮ f(u) du⎟│
⎜⌡ ⎟│
⌠ ⎜ ⎟│
⎮ f(2⋅x) dx = ⎜─────────⎟│
⌡ ⎝ 2 ⎠│u=2⋅x
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