Question Number 143257 by Mathspace last updated on 12/Jun/21
![find ∫∫_([0,1]) e^(−(x^2 +y^2 )) arctan(2(√(x^2 +y^2 )))dxdy](https://www.tinkutara.com/question/Q143257.png)
$${find}\:\int\int_{\left[\mathrm{0},\mathrm{1}\right]} {e}^{−\left({x}^{\mathrm{2}} +{y}^{\mathrm{2}} \right)} {arctan}\left(\mathrm{2}\sqrt{{x}^{\mathrm{2}} +{y}^{\mathrm{2}} }\right){dxdy} \\ $$