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Homework Help: Partial derivatives with constrained variables

  1. Apr 5, 2009 #1
    1. The problem statement, all variables and given/known data
    find (partialy/partialr)subscribt phetal, find (partialy/partialpheta)subscribtx, and find (partialy/partial)subsribt pehta

    2. Relevant equations
    im not sure how to write this partial in chain rule form. i think the first one (partialy/partialr)subscritpheta would simply be cos(pheta). however i have no idea how to write out the chair rule forumulas for the second and third one. please help

    3. The attempt at a solution
  2. jcsd
  3. Apr 6, 2009 #2
    please help asap !
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