Question 888889
You can use any unit circle picture online.

On the unit circle, a point is given to be (x,y) = (cosine,sine). 

Where on the unit circle is y or sine = -1/2?


At y = 11pi/6, and 7pi/6, the value is given to be -1/2. 


One the unit circle, y or sine equals -1/2 at the two above radian values given.