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Thread: Partial Derivitive Question

  1. March 5th 2011, 02:28 AM #1
    heatly
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    Partial Derivitive Question

    Having trouble understanding this one:


    r=sqrt(x^2 +y^2)

    and

    x= r cos theta


    show

    dr/dx * dx/dr not = 1
    Attached Thumbnails Attached Thumbnails Partial Derivitive Question-4.jpg  
    Last edited by heatly; March 5th 2011 at 03:59 AM.
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  2. March 5th 2011, 03:00 AM #2
    Prove It
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    Are you asked to show

    \displaystyle \frac{dr}{dx}\cdot\frac{dx}{dr} \neq 1

    or

    \displaystyle \frac{\partial r}{\partial x}\cdot\frac{\partial x}{\partial r} \neq 1?
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  3. March 5th 2011, 03:23 AM #3
    heatly
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    The second one you wrote iam asked to show.


    I actually thought they were both the same meaning,oops.
    I worked it ou now.
    Thanks for your post Prove it.
    Last edited by heatly; March 5th 2011 at 04:01 AM.
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