let be the integral:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\int_1^{\infty}\int_{-\infty}^{\infty}f(x,y)dydx [/tex]

i make the change of variable xy=u y=v whose Jacobian is 1/v but then what would be the new limits?...

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# Change of variables (i don,t understand)

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