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Question: hint given in question for b use a basic...

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a. Using de Moivres formula for z3 where z-cisẻ, find formulas for cos 39 and sin39 in terms of cos θ and sin θ. Using part (a), find a formula for cos 39 in terms of cos θ. Hint 2.6 Show that for any n, it is always possible to find a formula for cos n6 in b. C. terms of cos θ. d. Show that for any even n, it is always possible to find a formula for cos n in terms of even powers of cos θ.(Hint given in question : for (b) use a basic identity involving sine and cosine.)

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