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Find the sum of n terms of the seriesCos^3(a) +Cos ^3(3a) +Cos^3(5a) +..... +Cos ^3(2n-1)a Find the sum of n terms of the seriesCos^3(a) +Cos ^3(3a) +Cos^3(5a) +..... +Cos ^3(2n-1)a
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