Comment #17 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
I don't know if this is related to this integral any more, though, because
it returns the result, and instantly, in both master and in my branch, but
there is a similar error reported on Twitter:
http://nbviewer.ipython.org/github/yoavram/ipython-notebooks/blob/master/sympy%20bug.ipynb.
It's too slow to add a test for (and we can't even compute the integral),
but I added a test for the underlying issue, which is
RR[x].unify(ZZ.frac_field(y)).
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