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Ahh this one has been bugging me!

  1. Dec 7, 2007 #1
    Δƒ/Δx and Δƒ/Δy. ƒ(x,y) = xy² + x²y

    anyone able to calculate?
  2. jcsd
  3. Dec 7, 2007 #2
    I'm not sure what you mean by [tex]\frac{\Delta f}{\Delta x}[/tex]. Do you mean [tex]\frac{\partial f}{\partial x}[/tex]?

    At any rate, why don't you tell us what you've tried and where you get stuck?

    Physically Incorrect
  4. Dec 7, 2007 #3


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    Staff Emeritus
    Science Advisor

    Whether you mean the partial derivatives or the "difference quotients" those are both pretty straightforward by methods you learned in elementary calculus. How have you tried to do them?
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