$$U_{766}(x, y) = \frac{3 y \left(1 - \sqrt{- \frac{8 \sqrt{3} x \sin{\left(\frac{\arcsin{\left(\frac{3 \sqrt{3} \sqrt{y}}{2} \right)}}{3} \right)}}{3 \sqrt{y}} + 1}\right)^{3}}{32 x^{3} \sin^{2}{\left(\frac{\arcsin{\left(\frac{3 \sqrt{3} \sqrt{y}}{2} \right)}}{3} \right)}}$$

$$T_{766}(n, m, k) = \frac{3 k \left(k + n\right) {\binom{3 k + 2 n}{n}} {\binom{k + 3 m + n - 1}{m}}}{\left(3 k + 2 n\right) \left(k + 2 m + n\right)}$$