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cos2^(3)((pi)/(10))cos2^(4)((pi)/(10))co...

`cos2^(3)((pi)/(10))cos2^(4)((pi)/(10))cos2^(5)((pi)/10)....cos2^(10)((pi)/10)` is equal to A. `(1)/(128)` B `(1)/(256)` C `(1)/(512)sin(pi)/(10)` D `(sqrt(5)-1)/(512)sin(3 pi)/(10)`

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