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Homework Help: The power rule and the chains rule

  1. Apr 17, 2012 #1
    1. The problem statement, all variables and given/known data

    How do I know for sure when to use the power rule instead of the chain rule and vice versa?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 17, 2012 #2
    power rule is used when there are no variables in the raised part (ie. x^2 or 3x^6) but chain rule is used if there are variables in the raised part (ie. d/dx (e^(2x))=e^(2x) * d/dx (2x) = 2e^(2x) Chain rule is used in other situations but this is basically the situation where you would have to decide between chain and power rule as you are asking.
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