$$U_{926}(x, y) = \frac{1 - \sqrt{- 32 x y^{2} - 16 x y \sqrt{4 y^{2} + 1} - 4 x + 1}}{4 x y + 2 x \sqrt{4 y^{2} + 1}}$$

$$Tsqrt2(n, k) = \begin{cases}\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k even, where j =} \frac{n+k} {2},\\\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k odd, where j =} \frac{n+k+1} {2},\\\end{cases} $$$$T_{926}(n, m, k) = \frac{k \operatorname{Tsqrt_{2}}{\left(m,k + 2 n \right)} {\binom{k + 2 n}{n}}}{k + 2 n}$$