(adsbygoogle = window.adsbygoogle || []).push({}); whats derivative of arctan (xy) with respect to x

3. The attempt at a solution

- I feel kind of stupid for this one, but I can't seem to figure out the derivative here. I know with one variable that arctan goes to 1/(1+x^2), but I'm not sure what to do with two variables. please help.

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# Homework Help: Multi variable derivative

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