Comment #26 on issue 2132 by asmeurer: Derivative of RootSum http://code.google.com/p/sympy/issues/detail?id=2132
I think the problem, or at least part of the problem, is that it is trying to expand the RootSum into a sum or RootOfs instead of simplifying the rational function Lambda, which should come first in my opinion.
By the way, the problem is in printing the expression a.diff(x).doit(), or rather, the_RootSum.diff(x).doit().
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