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Let f(x)=(2cosx-1)(2cos2x-1)(2cos2^2x-1)...

Let `f(x)=(2cosx-1)(2cos2x-1)(2cos2^2x-1)(2cos2^n x-1),` (where `ngeq1)dot` Then prove that `f((2pik)/(2^n+-1))=1AAk in Idot`

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