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

I've attactched an image of the question, I hope this is ok, if not let me know and I'll copy it out onto a post,

3. The attempt at a solution

I've done parts (a) and (b) using the total derivative of f ( http://mathworld.wolfram.com/TotalDerivative.html ) but I can't get started on the last part. I've tried differentiating the expressions found in (a) but it doesn't seem to lead anywhere.

A push in the right direction would be appreciated.

Thanks

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# Partial derivatives/ total derivative

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