Simple partial differentiation

  • Thread starter kasse
  • Start date
  • #1
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Homework Statement



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


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?
 

Answers and Replies

  • #2
434
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Multiply the top and bottom of your answer by "v" and see what you get :wink:
 

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