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What are you stuck with?

\[\int\limits_{\pi}^{2\pi}\int\limits_{0}^{1}xsin(xy)dxdy\]

since your limits are constants; you can prolly more easily swap it for dydx

which proff did ... ironically :)

IRONICALLY?!?! LOOOOOOOOOOL

doh ... loathesome integrals!!

@amistre64 doesn't the zero to one have to stick with the dx differential though?

\[\int_{x=0}^{x=1}\left(\int_{y=\pi}^{y=2\pi}xsin(xy)~dy\right)dx\]

it tends to help me out if i label the integrals ....

Isn't the general integral of that xsin(xy)/y|

the dx, dy parts tells you what you focus on while leaving the other term a constant

LOLOL I forgot about that

I didn't realize you were evaluating limits in your 2nd step of that response

let x = k
int k sin(ky) dy -> -cos(ky)
-cos(x 2pi) - -cos(x pi)

thanks @amistre64