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Homework Help: Find the partial derivative?

  1. Oct 30, 2014 #1
    1. The problem statement, all variables and given/known data
    Find the partial derivative of a*cos(xy)-y*sin(xy) with respect to y.

    2. Relevant equations

    3. The attempt at a solution
    The answer is -ax*sin(xy)-sin(xy)-xy*cos(xy).
    I know that I need to treat x as constant since I need to take the partial derivative with respect to y. But I don't know how to get -sin(xy). I know how to get -ax*sin(xy) and -xy*cos(xy).
  2. jcsd
  3. Oct 30, 2014 #2
    Never mind. I got it.
  4. Oct 30, 2014 #3
    How do I delete this thread?
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