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March 26, 2015

March 26, 2015

Posted by **Katie** on Saturday, April 7, 2012 at 7:19pm.

4cos^2x+4cosx-1=0

- TRIG -
**bobpursley**, Saturday, April 7, 2012 at 7:41pmwhat is (2cosx+1-sqrt2)(2cos+1+sqrt2)

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