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\newcommand{\Bold}[1]{\mathbf{#1}}\frac{2 \, {\left(\frac{y \arctan\left(\frac{x}{\sqrt{y^{2} + 1}}\right)}{\sqrt{y^{2} + 1}} + \frac{x \arctan\left(\frac{y}{\sqrt{x^{2} + 1}}\right)}{\sqrt{x^{2} + 1}}\right)}}{\pi}
\newcommand{\Bold}[1]{\mathbf{#1}}\frac{4 \, x \arctan\left(\frac{x}{\sqrt{x^{2} + 1}}\right)}{\sqrt{x^{2} + 1} \pi}