Comment #14 on issue 1280 by [email protected]: integrate(1/((a-x)*(b-x)), x) is giving too complex results (probably correct)
http://code.google.com/p/sympy/issues/detail?id=1280
Or maybe we should just write a routine to manually combine logarithms after integration. I'm not sure what the best heuristic is. I believe we want to avoid fractions, as those can lead to unnecessary discontinuities in the result (leading to incorrect results if we apply the fundamental theorem of calculus). We actually need a similar heuristic for risch_integrate, because it has a bad habit of returning things with log(a*b) - log(a) instead of just log(b).
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