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General formula for cos x + cos 2x + cos 3x+......+cos nx

General formula for cos x + cos 2x + cos 3x+......+cos nx

Grade:12

1 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Dear student

It is a standard sequence its summarisation in general form is

(( Sin ( nx/2) )*( cos (( n+1)x/2)))/ (sin ( x/2)

Regards

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