
Code:
$ I_{2}=\int_{0}^{2\pi}d\theta\int_{0}^{R}\frac{\partial^{2}U}{\partial r\partial\theta}dr $

Code:
$ I_{2}=\int_{0}^{2\pi}d\theta\int_{0}^{R}\frac{\partial^{2}U}{\partial r\partial\theta}dr $
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