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Math Help - HELP in differential calculus

  1. #1
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    Exclamation HELP in differential calculus

    hey,I have 2 questions that I need help in .

    1)If U=tan^-1(x^3+y^3/x-y)Prove that x*du/dx + y*du/dy = Sin2U

    2)d^2u/2x*dy=d^2u/dx*dy wen U=log(x^2+y^2/xy)

    Please help..Will be greatly appreciated
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  2. #2
    MHF Contributor
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    Talking

    How does "U" relate to "u"? What did you find when you took the various derivatives?

    Please be complete. Thank you!
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  3. #3
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    Exclamation

    I think 'U' and 'u' are the same thing ??? Does that make any sense ?

    Although,
    1)If U=tan^-1(x^3+y^3/x-y)Prove that x*du/dx + y*du/dy = Sin2U

    this has something to do iwth Partial derivatives

    2)d^2u/2x*dy=d^2u/dx*dy wen U=log(x^2+y^2/xy)

    and this has something to do with Successive Partial Derivatives




    Well, honestly i am totally pathetic at this calculus so I have no clue at all It was an assignment question and the lecturer refuses to tell us how to do it ..Until we hand it in and obviously get it wrong ...

    Okay,sorry for goin into the history of pointless things ...I'm sure u dont rely care


    THANK YOU EVA SO MUCH
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