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Simplify the product cosA cos2A cos2^2A … cos2^n–1A.

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Simplify the product cosA cos2A cos22A … cos2n–1A.

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cosA⋅ cos2A … cos2n–1A = 1/2 sin A .(sinA⋅cosA)⋅cos2A … cos2n–1A)

= 1/2 sin A .(sinA . cos2A) ....cosn-1A

Continuing like this we have

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