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Homework Help: Finding the sum of this series

  1. Feb 1, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the sum of the series s(x) = 1 +cos(x)+ (cos2x)/2!+(cos3x)/3!...
    2. Relevant equations



    3. The attempt at a solution
    i'm miserable at series. help?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 2, 2009 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi thanksie037! :smile:

    Hint: this is the real part of what complex series? :wink:
     
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