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Find the partial derivatives of the function

  1. Feb 26, 2009 #1
    The problem:
    f(x,y)=-[tex]\frac{-7x-2y}{9x+7y}[/tex]

    find:

    fx(x,y)
    fy(x,y)

    The attempt:

    fx(x,y)=[tex]\frac{-7-2y}{9+7y}[/tex]
    fy(x,y)=[tex]\frac{-7x-2}{9x+7}[/tex]

    Questions:

    I'm not exactly sure how to find the partail derivative with a fraction like this one.
     
  2. jcsd
  3. Feb 26, 2009 #2
    use the quotient rule for differentiation? or product rule but with (9+7y)^(-1) for eg.

    is this homework? it looks like the wrong forum to me
     
  4. Feb 26, 2009 #3
    Oh sorry.
     
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