Comment #7 on issue 2132 by asmeurer: Derivative of RootSum http://code.google.com/p/sympy/issues/detail?id=2132
Ah, yes, I forgot about that function. Of course, it should be symmetric, because to be symmetric just means that we can reorder the r_i any way we like and still get the same expression, and of course this will be the case because it doesn't matter in what order we sum the `i` in the RootSum. And the numerator and denominator of the resulting rational function should be symmetric because of the symmetric nature of the formula for the sum of fractions.
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