We need to prove that f(x,y)=x^2 - 2xy is differentiable using epsilon-delta. When I do it, I just cant get rid of most of the terms.(adsbygoogle = window.adsbygoogle || []).push({});

It would be easy to prove that it's differentiable at (0,0), but differentiable at any point...it just doesnt seem to simplify.

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# Homework Help: Epsilon-delta proof

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