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What exactly does RootSum mean?

RootSum[#^2 - 1 &, f] // FullSimplify (*f[-1] + f[1]*) RootSum[#^3 - 1 &, Sin] // ToRadicals (*Sin[1] - Sin[(-1)^(1/3)] + Sin[(-1)^(2/3)]*) You can see ...
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