`cos A *cos 2A *cos 2^2 A *cos 2^3 A..... cos 2^n A = sin(2^n A) / (2^n Sin A)`

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`cos A *cos 2A *cos 2^2 A *cos 2^3 A..... cos 2^n A = sin(2^n A) / (2^n Sin A)`
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