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    Sum of a finite sine series

    \phi = \pi s /(N+1) where s = 1,2...N
  2. S

    Sum of a finite sine series

    Can anyone tell me what is the sum of a finite series of Sines. \sum_{n=1}^N \sin^2 (n \phi) . I am going through a text and it gives it as (N+1)/2. I tried to derive it. The N comes out ok when you use the half angle identity but I can't figure out a general rule for the Cosines that appear
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