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Examples
\displaystyle \begin{equation*}\int_{-\infty}^\infty \int_{-\infty}^\infty e^{-(x^2+y^2)/2} \, \mathrm{d}x \, \mathrm{d}y = \int_0^\infty \int_0^{2\pi} r e^{-r^2/2} \, \mathrm{d}\theta \, \mathrm{d}r\end{equation*}
\sqrt
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