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Homework Help: Sum approximation

  1. Jan 13, 2017 #1
    So this is actually a physics question, but i have a problem with just the math part of it, as i don't really get how to approximate this sum

    Problem 7.1


    The question is: how one gets Z_rot=1+3e^(-h^2/IkT) ? Is there some kind of formula for approximation ?


    2. Relevant equations

    3. The attempt at a solution
    I tried to perform operations and to simplify the expression but got to a dead end.
  2. jcsd
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