Question

What are the exact values of `cos 150°` and `sin 150°`?

Answer 1

`cos 150= - sqrt3/2`
`sin 150 = 1/2`

Explanation:

Use trig table and unit circle -->
`cos 150 = cos (-30 + 180) = - cos (-30) =`
`- cos 30 = - sqrt3/2`
`sin 150 = sin (- 30 + 180) = sin 30 = 1/2`