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Use Binomial theorem and De Moivre's the...

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.`

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