/usr/share/openscad/libraries/MCAD/math.scad is in openscad-mcad 2014.03-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | // MIT license
include <constants.scad>
function deg(angle) = 360*angle/TAU;
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