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How to take a derivative

  1. Jul 10, 2010 #1
    1. The problem statement, all variables and given/known data

    lim(x→∞)x^3 e^((-x)^2 )

    2. Relevant equations

    3. The attempt at a solution
    So I tried taking a derivative as both, multiplication and a fraction. I make a mistake somewhere. I get a very complicated answer.
    Last edited: Jul 10, 2010
  2. jcsd
  3. Jul 10, 2010 #2
    OK, I solved it.
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