$$U_{792}(x, y) = \frac{1 - \sqrt{1 - \frac{y \left(8 - 8 \cos{\left(\frac{2 \arcsin{\left(\frac{3 \sqrt{3} \sqrt{x}}{2} \right)}}{3} \right)}\right)}{3 x}}}{2 y}$$

$$T_{792}(n, m, k) = \frac{k {\binom{k + 2 m - 1}{m}} {\binom{2 k + 2 m + 3 n - 1}{n}}}{k + m + n}$$