I'm trying to evaluate the double integral(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\int \int \sqrt{x^2 + y^2} \, dA[/tex] over the region R = [0,1] x [0,1]

using change of variables

Now I know polar coordinates would be the most efficient way, and thus I could say r= [tex] \sqrt{x^2 + y^2} [/tex] . Is this legal to use polar coordinates when doing change of variables? So if I do it this way, would I integrate from theta goes from 0 to 2pi and then r goes from 0 to 1?

I'm utterly confused. Anyone able to help me out a bit? Thanks

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# Help with change of variables please

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