gutenberg/gutenberg — pull request #192 by abhinavc (2012-07-11 14:56:03+00:00)
Title: New trig specific commands in a new package file 

This is the first of .sty files that I intend to create to make typesetting
questions easier, quicker and robust by providing shortcut commands for
common mathematical expressions

Going forward, the same principle may be used when typesetting physics or
chemistry

At any rate, do read the README file