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What is result of this summation:sum(k=1, to n) sin(n*pi/k)I

  1. Apr 15, 2012 #1
    What is result of this summation:

    sum(k=1, to n) sin(n*pi/k)

    I put it in wolfram alpha but it doesn't give me the solution.
    Where is the problem?
     
  2. jcsd
  3. Apr 15, 2012 #2

    tiny-tim

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    try using sinθ = Im(e) :wink:
     
  4. Apr 15, 2012 #3
    Re: summation

    No, still doesn't calculate it.
     
  5. Jun 12, 2012 #4

    rbj

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    Re: summation

    first of all, are you sure it isn't

    [tex] \sum_{k=1}^n \sin(k \pi / n) [/tex]

    instead?

    second, in any case, complex numbers and variables, Euler's formula, and the sum of a geometric series are three mathematical methods that are your friends.
     
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