Posted by **Manny** on Monday, April 28, 2008 at 6:00pm.

Find two standard position primary angles in radians by solving for the unknown. "Primary angles" are those angles which exist between 0 and 2pi. As usual, use exact values in your calculations.

cosx - 2cos^2x = 0

- trig -
**Reiny**, Monday, April 28, 2008 at 7:31pm
cosx(1 - 2cosx)=0

cosx=0 or cosx=1/2

x = pi/2, 3pi/2, pi/3, 5pi/3 (90,270,60,300º)

## Answer this Question

## Related Questions

- trig - Find two standard position primary angles in radians by solving for the ...
- Trigononometry and plaine sperical - Find the exact values of the six ...
- pre-calc - How do you find coterminal angles between 0 and 2pi for angles given ...
- Per-calc Helppppp - keep in mind answers should be pi radians or if necessary 3 ...
- geometry - Two angles of a quadrilateral measure 210° and 100°. The other two ...
- Math - Two parallel lines cut by a transversal can create all the following ...
- Math - Which of the following correctly lists angle pairs that have the same ...
- vertex angle - The three angles add to 180 degrees. Also , the two base angles ...
- geometry - Angles 1 and 7 are alternate exterior angles of a transversal cutting...
- math - Two angles of a quadrilateral measure 130° and 20°. The other two angles ...

More Related Questions