Posted by **Anonymous** on Saturday, October 29, 2011 at 3:57pm.

I'm confused with this concept:

Okay, so I have this problem:

cos2x( 2 cos+1)= 0

I understand I have to work the problems separately and I get cos x= 2 and cos x= 1/2

Now, what I don't understand is how this connects to pi, radians or the unit circle. If someone could explain or point me to a place with a thorough explanation, please tell me. B/c trust me, I've looked EVERYWHERE and my book/teacher doesn't really explain the theory very well.

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