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Grade: 12th pass 

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

Answers : (1)

Deepak Kumar Shringi
askIITians Faculty
4403 Points 
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2 years ago
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