$$U_{287}(x, y) = \frac{\sqrt{3} \sqrt{x} - \sqrt{3 x - 16 y \sin^{2}{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x}}{2} \right)}}{3} \right)}}}{4 y \sin{\left(\frac{\operatorname{asin}{\left(\frac{3 \sqrt{3} \sqrt{x}}{2} \right)}}{3} \right)}}$$

$$T_{287}(n, m, k) = \frac{k {\binom{k + 2 m}{m}} {\binom{k + 2 m + 3 n - 1}{n}}}{k + 2 m + 2 n}$$