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Homework Help: Convergence of a Series with Trig Functions

  1. Feb 18, 2010 #1
    1. The problem statement, all variables and given/known data

    *The sum from n = 1 to infinity* (cos(n*pi))^2/n*pi where n is the variable.

    2. Relevant equations

    All forms of convergence tests (i.e. Ratio Test, Integral Test, Alternating Series test etc.)

    3. The attempt at a solution

    I am having trouble figuring out which route to take to tackle this question. Any help would be appreciated!
  2. jcsd
  3. Feb 18, 2010 #2


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    Try writing out the first few terms of the series. You'll see it's not as complicated as you think.
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