Find the exact values of cos 210° and sin 210°
To find the exact values of cos 210° and sin 210°, we need to use the unit circle.
On the unit circle, 210° is in the third quadrant, which corresponds to a reference angle of 30° (180° - 150° = 30°).
Since the cosine function is negative in the third quadrant, we know that cos 210° = -cos 30° = -√3/2.
Since the sine function is also negative in the third quadrant, we know that sin 210° = -sin 30° = -1/2.
Therefore, the exact values of cos 210° and sin 210° are -√3/2 and -1/2, respectively.