(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

[PLAIN]http://img408.imageshack.us/img408/7163/partialdifferent.jpg [Broken]

So this means differentiate w.r.t y first, so I want dz/dy, and then w.r.t x right?

so I rearrange so that y=z^{3}/3 + xz

and differentiate w.r.t z to get dy/dz, and then do 1 over this which i get as:

1/(z^{2}+x)

and then differentiating this w.r.t x, I get

-1/(z^{2}+x)^{2}

which isn't quite right. Can anyone see where I've gone wrong? Thanks.

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

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Partial Differentiation (very simple mistake, I think!)

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