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If n-1,2,3,dot,t h e ncosalpha"cos"2alph...

If `n-1,2,3,dot,t h e ncosalpha"cos"2alpha"cos"4alphacos2^(n-1)alphai se q u a lto` `(sin2nalpha)/(2nsinalpha)` (b) `(sin2^nalpha)/(2^n"sin"2^("n"-1)alpha)` (c) `(sin4^(n-1)alpha)/(4^(n-1)sinalpha)` (d) `(sin2^nalpha)/(2^n"sin"alpha)`

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