Prove that (a) (b) 1 + cos 0 + cos 20 + sin+sin 20 + + cos(n − 1)0 + sin(n − 1)0 = = COS sin (n-1) 2 sin (n-1)0 sin 2 sin 2 sin no 2 no 2

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A:

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A:

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A: NOTE: Refresh your page if you can't see any equations. . the given expression is

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A: