$$U_{925}(x, y) = \frac{- 2 y - \sqrt{4 y^{2} + 1}}{2 x y + x \sqrt{4 y^{2} + 1} - 1}$$

$$Tsqrt2(n, k) = \begin{cases}\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k even, where j =} \frac{n+k} {2},\\\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k odd, where j =} \frac{n+k+1} {2},\\\end{cases} $$$$T_{925}(n, m, k) = \frac{k \operatorname{Tsqrt_{2}}{\left(m,k + n \right)} {\binom{k + n}{n}}}{k + n}$$