Sketch the angle. Then find the reference angle.
Just solve one of them and let me do the other one by myself plz
-5pi/ 6 = -150”
2pi - 5pi/6 =
12pi/6 - 5pi/6 =
7pi/6 = 210°
So....the refererence angle is [ 210 - 180]° = 30° in the 3rd quadrant
Here's a sketch