Comment #6 on issue 2132 by mattpap: Derivative of RootSum http://code.google.com/p/sympy/issues/detail?id=2132
We already have symmetrize() function for computing symmetric reduction, so this is definitely doable. The question is if we can ever hit the non-symmetric case in symmetrize(). I think that we can't because lambda depends only on the i-th root, so after putting the sum together we get a symmetric expression.
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