Comment #1 on issue 2297 by renato.c...@gmail.com: Integral manipulations http://code.google.com/p/sympy/issues/detail?id=2297
A nice addition, though I don't know if the current infra-structure supports this, would be to recognize even and odd functions and rewrite the intervals correspondently, if they are symmetric.
I found out change of variables is already implemented in transform(), but it was counter-intuitive to me, I expected the default behavior to be what inverse=True does -- that is, the mapping applies to the variable of integration, not the integrand. BTW, does this work for a single variable only, so it's not possible to change from euclidean to polar coordinates yet?
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