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Taylor series for cos[1/(1-z^2)]

  1. Feb 19, 2012 #1
    Bit stuck on this. I tried writing 1/(1-z^2) as taylor series then Cos z as taylor series, then substituting one into the other but it looked a bit dodgy. Can one simple substitute like this?
     
  2. jcsd
  3. Feb 19, 2012 #2

    vela

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    Yes, you can, though it tends to be tedious to work out.
     
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