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## Homework Statement

[tex] \int_{0}^{1}\int_{0}^{1} xy \sqrt{x^2 + y^2} dy dx [/tex]

## Homework Equations

## The Attempt at a Solution

So I tried integration by parts, but I'm not really coming up with anything simpler. I also thought I could use a u substition, letting u= x^2+y^2, but then it was looking so messy that I thought it must be wrong. Its been a while since I've done calculus, so I'm just really unconfident in my approach.