radicalSolve(x^5-1,x) gives results with sin and cos,
but (x^5-1)= (x-1)*(x^4+x^3+x^2+x+1), so the roots can be
expressed with only radicals.

(BTW, radicalSolve(x^4+x^3+x^2+x+1,x) also gives sin/cos.)

I think for consistency, "radicalSolve" should not give
answers with sin/cos (aka cyclotomic roots) when there's
radical root available.

This can be solved by tweaking "solveInner" in sovlerad.spad.

- Qian

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