Find the exact values of cos 150° and sin 150°.
1
Cos = -- , sin =
2
Cos = - , sin =
2
1
Cos =-
Cos =
V3
2
V3
2
V3
2
V3
2
sin =.
2
.sin =- 2
Therefore, the exact values of cos 150° and sin 150° are:
cos 150° = -√3/2
sin 150° = 1/2