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Cant understand this transition

  1. Jan 14, 2010 #1

    cant see how they put the only the denominator to be equal the new expression.
  2. jcsd
  3. Jan 14, 2010 #2


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    They used


    where [itex]x=2z^2/4!+...[/itex]. It looks like they made a sign mistake when they did that, though.
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