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

Jonah , 7 Years ago
Grade 12
anser 1 Answers
Saurabh Koranglekar

Last Activity: 5 Years 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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