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Finding derivative?

  1. Feb 6, 2009 #1
    f(x)=20x^3 - 3x^5

    f '(x)=60x^2 - 15x^4

    f ''(x)=120x-60x^3

    Is this correct?
  2. jcsd
  3. Feb 6, 2009 #2
    Looks like it.
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