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If A is not an integral multiple of (pi)...

If A is not an integral multiple of `(pi)`, prove that `cos A cos 2A cos 4A cos 8A =(sin 16A)/(16 sin A)` Hence deduce that `cos. (2pi)/(15). Cos. (4pi)/(15) .cos. (8pi)/(18). Cos. (16pi)/(15)=(1)/(16)`

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