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Prove that, (2 cos theta - 1)(2 cos 2 th...

Prove that, `(2 cos theta - 1)(2 cos 2 theta-1)(2 cos2^(2) theta-1)...(2 cos 2^(n-1) theta-1) = (2 cos 2^(n) theta + 1)/(2 cos theta + 1)`

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