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January 25, 2015

January 25, 2015

Posted by **AwesomeGuy** on Thursday, February 28, 2013 at 1:01am.

-2cos²x-sin x+1=0, on the interval [0,2π).

- Trigonometry -
**Steve**, Thursday, February 28, 2013 at 10:54am-(2cosx-1)(cosx+1) = 0

so, where is cosx = 1/2 or -1?

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