PLEASE read the documentation at Moodle.org on using DragMath before installing. The documentation can be found at: http://docs.moodle.org/en/DragMath_equation_editor. The zip archive for installing DragMath with Moodle integration can be downloaded by clicking here
In order to make DragMath installation for Moodle users as simple as possible, the DragMath package has been integrated with Moodle and a zip created so that the user can simply place the new zip in their Moodle root and unzip (no file shifting necessary). To accommodate this installation method a replacement for the file adminlib.php is not provided, though /lib/adminlib_exampleonly.php has been provided so that you can compare this version to your own version so as to make the quick line change in your own adinlib.php to allow you to hide the dragmath icon (by adding the icon to the adminlib.php icon array for the GUI.
Credit for making the integration possible goes of course to Chris, Alex and the DragMath folks as well as to Mauno Korpelainen
NB: There has been discussion that a line in dialog.js has produced some problems in Moodle version 1.9.5+ (the editor disappears) and that by deleting the line that adds the dragmath icon the problem is resolved. This may be an artifact of the impact of the icon sizing, so if you discover such a situation please post at once to the Math Tools forum on Moodle.org so that the situation can be fully documented and resolved.Marc Grober, May 2010