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September 20, 2014

September 20, 2014

Posted by **Romeo** on Thursday, April 10, 2014 at 10:37am.

Cos^2(x)+2cos(x)+1=0

- Math -
**Steve**, Thursday, April 10, 2014 at 11:49am(cosx + 1)^2 = 0

cosx = -1

that should help, no?

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