Updates:
Status: Accepted
Labels: Integration
Comment #1 on issue 2239 by asmeurer: Change ratint to give an answer as
hyperbolic functions instead of logs.
http://code.google.com/p/sympy/issues/detail?id=2239
This needs some taking looking at to see how to combine the logarithms into
an atanh or the others. Probably it would be similar to the algorithm that
combines into atans.
Anyway, it is nontrivial to implement.
We should also maybe fix rewrite so that integrate(1/(x**2 - 1),
x).rewrite(atanh) works.
And by the way, it is atanh not arctanh.
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