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September 20, 2014

September 20, 2014

Posted by **Yadira** on Monday, April 30, 2012 at 12:22am.

- Pre-Calc/Math -
**Steve**, Monday, April 30, 2012 at 11:46amcos2x = 2cos^2(x) - 1 = 2(4/9)-1 = 8/9-1 = -1/9

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