Comment #29 on issue 2132 by mattpap: Derivative of RootSum http://code.google.com/p/sympy/issues/detail?id=2132
In 30c7fa78690828a0ac12b0e84c7ede31f4d4beff in polys12 I also fixed the problem with subs() (actually I fixed RootOf(*RootOf(...).args)).
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