Updates:
Labels: NeedsReview
Comment #10 on issue 1851 by asmeu...@gmail.com: Integral((-60*exp(x) -
19.2*exp(4*x))*exp(4*x), x).doit() extremely slow
http://code.google.com/p/sympy/issues/detail?id=1851
And risch_integrate() fails with DomainError because the polys can't handle
floats. I made https://github.com/sympy/sympy/pull/1628 to at least make
it give NotImplementedError.
I suppose in the long run, we will either need to fix the polys, or else
employ a solution like the one used in solve().
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