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Math Help - Conservative field?

  1. #1
    Junior Member
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    Conservative field?

    Hi.

    Just checked my answer on a question from my workbook on line integrals. Almost nailed it but not quite.

    Question is this.

    Verify that the following vectorfield is conservative and determine itīs "potential function" (Donīt know if itīs the correct translation but maybe youīll get it from my attempt)

    Attachment 20908

    I get an extra 2 in the answer and I donīt know why. This is extremely irritating as I get stuck with small problems. Takes a lot of time which I donīt have. So what did i miss?

    -WS
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  2. #2
    Senior Member abhishekkgp's Avatar
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    the mistake is that you have written \frac{\partial \phi}{\partial y} = C_1^{ \prime} (y). this is wrong.
    instead it should be  \frac{\partial \phi}{\partial y}= e^x cosy + C_1^{ \prime} (y)
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  3. #3
    MHF Contributor FernandoRevilla's Avatar
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    All is correct except for the last line:

    \varphi (x,y)=e^x\sin y +C_1(y)=e^x\sin y +C_2


    Why on earth do you write twice e^x\sin y ?


    Fernando Revilla


    Edited: Sorry, I didn't see abhisekkgp's post.
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