The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/e9b67be2c4853c7440eea733ac691ec5.gif" -- '\Large \mathbf{r}(t) =\begin{cases}x(t)=x_0+r_0\cos t,\\ y(t) = y_0+r_0\sin t.\end{cases}'
returned status = 126
Image not found!
Please try the debugging script