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f(x)=(2cosx -1)(2cos2x -1)............(2cos2 n-1 x -1) then f((2πK)/(2 n ±1))=? f(x)=(2cosx -1)(2cos2x -1)............(2cos2n-1x -1) then f((2πK)/(2n ±1))=?
f(x)=(2cosx -1)(2cos2x -1)............(2cos2n-1x -1) then
f((2πK)/(2n ±1))=?
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