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Math Help - sum of cos terms

  1. #1
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    sum of cos terms

    How to find sigma(summation) n from -N to N for the exp
    cos2(4n+60)?
    Thank you
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  2. #2
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    This is almost unreadable. Are you asking to evaluate

    \displaystyle \sum_{n = -N}^N{\cos{[2(4n+60)]}}?
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  3. #3
    MHF Contributor Also sprach Zarathustra's Avatar
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    Quote Originally Posted by Prove It View Post
    This is almost unreadable. Are you asking to evaluate

    \displaystyle \sum_{n = -N}^N{\cos{[2(4n+60)]}}?

    Or maybe:

    \displaystyle \sum_{n = -N}^N{e^{\cos^2{(4n+60)}}}<br />
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  4. #4
    A Plied Mathematician
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    According to a pm from vikrant, Prove It has the correct formula to be evaluated, I believe. So, what's desired is

    \displaystyle\sum_{n=-N}^{N}\cos(8n+120).

    I am not qualified to answer this question (other than simply asking Mathematica to spit out the answer, which it does), so someone else please continue.
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