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6. Prove the following trigonometric identities. a) cosx + cos 2x + cos 3x = cos 2x(1+2cos x) 1 + sin x + cos x

6. Prove the following trigonometric identities. a) cosx + cos 2x + cos 3x = cos 2x(1+2cos x) 1 + sin x + cos x X b) = cot- 1 + sin x - cos x N

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