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Homework Help: Simplify as one expression

  1. Mar 12, 2005 #1
    I need some help

    I got an expression involving series...

    x - (2/6)x^3 - (20/120)x^5 - (1080/5040)x^7 - (140400/362880)x^9 - ...

    I remove x from my summation expression.. but

    Right now, I can express as a summation from n = 1 to infinity of

    (??) x^(2n + 1) / (2n + 1)!

    That is.. what is my pattern in this: 2, 20, 1080, 140400,... ?
  2. jcsd
  3. Mar 13, 2005 #2
    Am I correct to say that you want to find the general term to express it as one summation?
  4. Mar 13, 2005 #3
    Yes. That is what I want to know... thank you for your clarification
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