Decompose the function below into $u \left( v(x) \right)$. In each part, based on the function $v(x)$ given, find the corresponding $u(x)$ needed to decompose the function. $$y = \frac{5 + x^{2}}{2 + x^{2}}$$

(a) $v(x) = x^{2}$, $u(x) =$

(b) $v(x) = x^{2} + 5$, $u(x) =$