openwebwork/webwork-open-problem-library — pull request #6 by bmargolius (2013-02-22 17:00:28+00:00)
Title: add trigonometric_substitution problem set to OPL

adds trigonometric_substitution problem set to CSUOhio collection. Needs trigSubWW.swf applet in htdocs/applets directory for use in hints. Also uses trigsub.png for alternate display in pdf.