If `n=1,2,3,.......,` then `cosalphacos2alphacos4alpha.......cos2^(n-1)alpha` is equal to

If n=1,2,3,......, then cos alpha cos2 alpha cos4 alpha.........cos2^(n-1)alpha is equal to

If n=1,2,3,……. then cos alpha cos 2 alpha cos 4 alpha ……. Cos 2^(n-1) alpha is equal to

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)

If 4nalpha=pi , then cotalpha cot2alpha cot3alpha.... cot(2n-1)alpha is equal to

If alpha is the angle which each side of a regular polygon of n sides subtends at its cente,then 1+cos alpha+cos2 alpha+cos3 alpha+......+cos(n-1)a is equal to

If 4n alpha=pi then cot alpha cot2 alpha cot3 alpha...cot(2n-1)alpha n in Z is equal to

If 4nalpha =pi then cot alpha cot 2 alpha cot 3alpha ...cot (2n-1)alpha n in Z is equal to