# Thread: Finding exact values of trignometric functions

1. ## Finding exact values of trignometric functions

How do I find the exact values of trigonometric functions like sin 120° and cos 120°?

2. $\sin 120 = \sin (180-60) = \sin 60 = \dots...$

$\cos 120 = \cos (180-60) = -\cos 60 = \dots...$

what do you think?