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9. Prove that (a) COS (n-1)0 1 + cos 0 + cos 20+ ... . sin ne . + cos(n - 1)0 = 2 2

9. Prove that (a) COS (n-1)0 1 + cos 0 + cos 20+ ... . sin ne . + cos(n - 1)0 = 2 2 sin NE NIG (n-1)0 (b) sin 0 + sin 20 + ....... sin .. + sin(n - 1)0 = 2 sin sin

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