$$U_{935}(x, y) = \frac{2 x y - x \sqrt{- 4 x y + 4 y^{2} + 1} - 1}{4 x y - 1}$$

$$Tsqrt2(n, k) = \begin{cases}\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k even, where j =} \frac{n+k} {2},\\\frac {k \binom{n+j}{n} \binom{2n+2j}{n+j}} {\binom{2j}{j} {n+k}} &\text{if n+k odd, where j =} \frac{n+k+1} {2},\\\end{cases} $$$$T_{935}(n, m, k) = \begin{cases}1&\text{if n=0 , m=0} ,\ \\\frac{k \operatorname{Tsqrt_{2}}{\left(m,n \right)} {\binom{k + m}{n}}}{k + m} \end{cases} $$