RootSum
 Usage
• RootSum[f, form] represents the sum of form[x] for all x that satisfy the polynomial equation f[x]  0.
Notes
• f must be a Function object such as (#^5 - 2 # + 1)&. • form need not correspond to a polynomial function. • Normal[expr] expands RootSum objects into explicit sums involving Root objects. • f and form can contain symbolic parameters. • RootSum[f, form] is automatically simplified whenever form is a rational function. • RootSum is often generated in computing integrals of rational functions. • New in Version 3.
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