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.

## Answer This Question

## Related Questions

- TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
- Precal - I do not understand how to do this problem ((sin^3 A + cos^3 A)/(sin A...
- math - Find the exact value of cos 300 degrees. thanks guys cos 300 = 1/2 = 0....
- Math - Solving Trig Equations - What am I doing wrong? Equation: sin2x = 2cos2x ...
- trig - I am very confused about the concepts of.. sin è = sin(180 - è) sin (180...
- Pre-Cal (Trig) Help? - The following relationship is known to be true for two ...
- calculus - Differentiate. y= (cos x)^x u= cos x du= -sin x dx ln y = ln(cos x)^x...
- Calc. - Differentiate. y= (cos x)^x u= cos x du= -sin x dx ln y = ln(cos x)^x ln...
- trig - Please help me solve this problem. I have a test tomorrow and I do not ...
- trig - it says to verify the following identity, working only on one side: cotx+...

More Related Questions