Find two angles between 0 and 2π for the given condition. cos= -square root 3 over 2

Answer 1

since cosine is negative the two angle are in QII and QIII.

For sqrt(3)/2, reference angle is 30. In QII that is 150 and in QIII that is 210.

in radians that is 150 * pi/180 = 5/6 PI and 210 * PI/180 = 7/6 PI