1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook