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Application of De Moivre's theorem....

Application of De Moivre's theorem.

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Use Binomial theorem and De Moivre's theorem to show cos 3 theta=4 cos^3 theta-3cos theta , sin3theta=3sin theta-4 sin^3 theta Express cos ntheta as sum of product of power of sin theta "and" cos theta . Do the same thing for sin n theta.