9. When $s$ and $t$ take all real values, the minimum value that $(s+5-3|\cos t|)^{2}+(s-2|\sin t|)^{2}$ can achieve is
9.2 Hint: $(s+5, s)$ is a point on the line, and $\left\{\begin{array}{l}x=3|\cos t| \\ y=2|\sin t|\end{array}\right.$ is a point on the elliptical arc. Clearly, the point $(3,0)$ on it has the minimum square of the distance to the line, which is 2.