- #1
ACLerok
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Homework Statement
I am reviewing some old exam solutions and came across something I cannot figure out. I'm don't understand how they simplify from the first equation to the second. I looked up a table of trig identies but could not find anything that would help.
Homework Equations
http://img296.imageshack.us/img296/864/untitledimageda3.th.jpg
The Attempt at a Solution
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