Question

What is the value of cos(150°)?

OF
22
-
V3
2.
1500
30
-

Answer 1

`cos(150^o)=-(√(3) )/(2)`

Explanation:

Recall that the value of the cosine of an angle in the unit circle is the horizontal value (x-coordinate) read-out for the point on the circle's circumference that represents the given angle.

in this case, notice that
`150^o` corresponds to an angle in the second quadrant, and the actual coordinate values for it are given to you. therefore, use the value you read for the x-coordinate:
`-(√(3) )/(2)`