$\begin{array}{1 1} \frac{e^{1/2 \sqrt x}}{4 \sqrt x} \\ \frac{e^{-1/2 \sqrt x}}{4 \sqrt x} \\ \frac{e^{2 \sqrt x}}{ \sqrt x} \\ \frac{e^{2 \sqrt x}}{4 \sqrt x}\end{array} $