Code:
$ I_{1}=\int_{0}^{R}dr\int_{0}^{2\pi}\frac{\partial^{2}U}{\partial r\partial\theta}d\theta $
Code:
$ I_{1}=\int_{0}^{R}dr\int_{0}^{2\pi}\frac{\partial^{2}U}{\partial r\partial\theta}d\theta $
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