## Ilovepurple42043 one year ago use the unit circle to find the inverse function value degrees. cos^-1(sqrt2/2)

1. anonymous

You should ask this question in pre calc you might get a better answer

2. Ilovepurple42043

is ther a pre calc section?

3. Nnesha

4. Nnesha

|dw:1432753605791:dw| CAST rule given cos value is positive so its either in first or 4th quadrant

5. Ilovepurple42043

ther is sorry. 2 sin theta cos theta+cos theta=0 @Nnesha

6. alyssa_xo

as nnesha said, it's either in the 1st or 4th quadrant http://upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Unit_circle_angles_color.svg/1024px-Unit_circle_angles_color.svg.png reference this

7. Ilovepurple42043

yay awesome thanks

8. Nnesha

$\huge\rm 2sin \theta \cos \theta + \cos \theta = 0$ take out common factor set it equal to 0 solve for cos and sin