Code:
\[ \frac{\partial^{2}U}{\partial r\partial\theta}=\frac{H(r,\theta)}{(P^{2}+Q^{2})^{2}} \]
Code:
\[ \frac{\partial^{2}U}{\partial r\partial\theta}=\frac{H(r,\theta)}{(P^{2}+Q^{2})^{2}} \]
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