The shell command<br />"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/a490cfd5f75e062b063895d2f080fea1.gif" -- '\Large 
\cos\varphi =\frac{\mathbf{N}\cdot  \mathbf{k}}{\|\mathbf{N}\| \,\|\mathbf{k}\|} =
\frac{1}{\|\mathbf{N}\|}.
 '<br />returned status = 126<br />
Image not found!<br />Please try the <a href="https://mycourses.aalto.fi/filter/tex/texdebug.php">debugging script</a>