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Homework Help: Expanding an equation

  1. Oct 21, 2009 #1
    1. The problem statement, all variables and given/known data

    I'm in the middle of a question and I need to expand

    1/(x√(1-2cosθ/x)) in powers 1/x up to order of 1/x^3

    2. Relevant equations

    3. The attempt at a solution

    This is my attempt to the more complicated question.
    To get to the final answer, I need to know how to expand the above question.
    I've simplified to 1/(x√(1-2cosθ/x)).
    now... do I use taylor expansion? But I'm not give Ao or Xo thus I can't have (X-Xo)

    Please! Any help would be really appreciated!! Thank you.
  2. jcsd
  3. Oct 21, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hi rockstar101! :smile:

    Hint: what is the expansion of 1/√(1 -a) in terms of a? :wink:
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