Question: . Prove that (a) 1+ C + C + (b) Ch+C+ C+... (c) C+ C+ C+ = 1 (2 +2008). cos 3 3 (n

. Prove that (a) 1+ C + C + (b) Ch+C+ C+... (c) C+ C+ C+ = 1 (2" +2008). cos 3 3 (n 1 (2 + 2008 (12) x) cos 3 3 (n = = 1/3 (2 + 2008 (1 = 4) =) = cos 3 =

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