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April 21, 2015

April 21, 2015

Posted by **Anonymous** on Thursday, March 1, 2012 at 7:10pm.

- trig -
**MathMate**, Thursday, March 1, 2012 at 8:49pmcos(4x) + cos(2x)

=cos(3x+x)+cos(3x-x)

=2cos(3x)cos(x)

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