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Math Help - finding the derivative

  1. #1
    Member
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    Oct 2008
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    finding the derivative

    <br />
xy = sin(x^2 + y^2)<br />

    <br />
x \cdot y' + y = sin(x^2 + y^2)<br />

    when i take the derivative of the right side is it:

    <br />
cos(x^2 + y^2) \cdot 2x \cdot 2yy'<br />
    or
    <br />
cos(x^2 + y^2) \cdot 2x + cos(x^2 + y^2) \cdot 2yy'<br />

    or none of the above?
    thanks
    Last edited by qzno; October 30th 2008 at 03:16 PM.
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  2. #2
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    Re: Derivative

    <br />
cos(x^2 + y^2) \cdot 2x \cdot 2yy'<br />
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