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

[PLAIN]http://www.netbookolik.com/wp-content/uploads/2010/07/q1.png [Broken]

2. Relevant equations

3. The attempt at a solution

I thought, in order to take derivative function must be cont. so it would be nice to check limf as (x,y) goes to (0, 0) but it did not seem to be a correct solution because appliying l'hopital gets harder and harder. If anyone can help me to solve this problem?

Thanks!

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# Homework Help: Considering Existing of a Partial Derivative

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