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Basic Calculus

  1. Feb 1, 2015 #1
    1. The problem statement, all variables and given/known data

    x^2 + y^2 < 1

    Find the partial derivatives of the function.

    2. Relevant equations

    x^2 + y^2 < 1

    3. The attempt at a solution

    @f/@x = 2x = 0
    @f/@y = 2y = 0

    4. Their solution

    @f/@x = 2x = 0
    @f/@y = 2y + 1 = 0

    5. My Problem


    I don't see how / why they get 2y + 1 for the partial of y????
     
  2. jcsd
  3. Feb 1, 2015 #2
    Issue is resolved, there was an error in reading the text.
    I cannot see how to delete the question though?
     
  4. Feb 1, 2015 #3

    Mark44

    Staff: Mentor

    Questions about differentiation should be posted in the Calculus & Beyond section.

    Just because a question has been answered it is not ordinarily deleted.
     
  5. Feb 2, 2015 #4
    1. Given the elementary nature of the question, why is Calculus & Beyond Homework not the correct section?
    2. It is not a function of deleting an answered question. I misunderstood something I was reading, and thereby posted an erroneous question.
     
  6. Feb 2, 2015 #5

    Mark44

    Staff: Mentor

    It IS the correct section. You initially posted it in the Precalculus section. I moved it.
    You can post the corrected question here in this thread.
     
  7. Feb 2, 2015 #6
    Ok . . . mea culpa for the section error.
     
  8. Feb 2, 2015 #7
    Once I realised my error, I no longer had a problem with the question.
    Hence wanting to delete it. But I see how it works, thank you.
     
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