I'm not quite sure how to solve this question:
cos(x) = 0.66
I am supposed to find all of the real numbers in the interval [0, 2pi] that satisfy the equation above. (Round to the nearest hundredth)
So far, I have x = cos^-1(0.66) = 0.850
OK......you found one answer (in rads)
To find the other answer......cosine is positive in the 4th quadrant.....so.....the other angle (in rads) will be reference angle of .850 rads in the 4th quad.....so.....
2pi - .850 ≈ 5.433 rads