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Math Help - Sum of sines.

  1. #1
    arm
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    Sum of sines.

    Prove: sin (\frac{\pi }{25}) + sin (\frac{2\pi }{25}) +...+ sin (24\frac{\pi }{25})=cotg\frac{\pi }{25}
    Last edited by mr fantastic; February 26th 2011 at 01:59 PM. Reason: Re-titled.
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  2. #2
    Flow Master
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    Quote Originally Posted by arm View Post
    Prove: sin (\frac{\pi }{25}) + sin (\frac{2\pi }{25}) +...+ sin (24\frac{\pi }{25})=cotg\frac{\pi }{25}
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