$$U_{790}(x, y) = \frac{3 x \left(1 - \sqrt{1 - \frac{16 y \left(1 - \cos{\left(\frac{2 \arcsin{\left(\frac{3 \sqrt{3} \sqrt{x}}{2} \right)}}{3} \right)}\right)^{2}}{9 x^{2}}}\right)}{y \left(4 - 4 \cos{\left(\frac{2 \arcsin{\left(\frac{3 \sqrt{3} \sqrt{x}}{2} \right)}}{3} \right)}\right)}$$

$$T_{790}(n, m, k) = \frac{k {\binom{k + 2 m}{m}} {\binom{2 k + 4 m + 3 n - 1}{n}}}{k + 2 m + n}$$