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Homework Help: Simple partial differentiation

  1. May 17, 2008 #1
    1. The problem statement, all variables and given/known data

    Differentiate f = arctan(u/v) with respect to u


    3. The attempt at a solution

    Using the chain rule

    fu = (1/(1 + (u/v)2)) * 1/v = 1/(v + u2/v)

    The solutions manual says v/(u2 + v2)

    What is my mistake?
     
  2. jcsd
  3. May 17, 2008 #2
    Multiply the top and bottom of your answer by "v" and see what you get :wink:
     
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