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Homework Help: Power series

  1. Mar 17, 2005 #1
    can someone tell mehow to expand [tex] (1 - \frac{2n}{(n+1)^2})^2 [/tex] into power series

    or at least direct me to the formula!!
  2. jcsd
  3. Mar 17, 2005 #2
    actaully i wnated to investigate [tex] \lim_{n \rightarrow \infty} (1- \frac{1}{2} (\frac{n-1}{n+1})^2 [/tex] but i used L'Hopital's rule and found that it would be 1/2.

    Thanks anyway!
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