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I usually know how to do double integrals, but i have no idea how to deal with this one. plz help me solve/understand this.
integrate with respect to y first and then with respect to x, plugging in the limits as you go. note, when integrating with respect to y, treat x as a constant, and vice versa.
you need integration by parts here. to start off, let $\displaystyle u = xy$ and $\displaystyle dv = e^{x + y}~dy$ (remember, x is a constant!)
hehe, even nicer