Comment #1 on issue 4044 by [email protected]: Avoid NotImplementedError:
Cannot work with non-rational coefficients in this case. in
risch_integrate()
http://code.google.com/p/sympy/issues/detail?id=4044
I remember now. One can just change it to "return None", but the problem is
that any integral that didn't work will just raise NotImplementedError in
another part of the code (or at least every integral that I've tried so
far). There are two instances (one that comes from log integrals and one
that comes from exp integrals) and they both seem to rely on algorithms
that aren't implemented yet when they are replaced this way. So it isn't
very helpful, at least yet.
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