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  3. prove that 1+ cos theta + cos 2theta + .... cos nt

Prove that 1+ cos theta + cos 2theta + .... cos ntheta = 1/2 + (sin(n+1/2)theta)/2sin(theta/2)

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Advance Math

Prove that 1+ cos theta + cos 2theta + .... cos ntheta = 1/2 +(sin(n+1/2)theta)/2sin(theta/2)

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