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2nd derivative trouble

  1. Aug 25, 2008 #1
    f(x)=x/x^2+1
    f'(x)= 1-x^2/(x^2+1)^2
    But then I can't seem to work through taking the 2nd derivative, perhaps I am not using the chain rule right.
    I get -4x^5-2x^3-2x/(x^2+1)^4
    But thats not right... please help!
     
  2. jcsd
  3. Aug 25, 2008 #2

    CompuChip

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    Science Advisor
    Homework Helper

    You double-posted, probably by accident. But let's stay in one thread.
     
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