Question

express cos 150degrees in surd form

Answer 1

Step-by-step explanation:

The value of sin 180 (sin pi) can be interpreted in terms of different angles like 0°, 90° and 270°. ... We know that the exact value of sin 0 degree is 0. So, Sin 180 degree is +(sin 0) which is equal to +(0) Therefore, the value of sin 180 degrees = 0.

Answer 2

First of all, observe that

150=180−30

Then, remember that we have

cos(180−x)=−cos(x)

sin(180−x)=sin(x)

Plug in

x=30

to get

cos(180−30)=−cos(30)

sin(180−30)=sin(30)

the answer comes from the fact that

What are the exact values of cos 150° and sin 150°? Trigonometry 1 Answer KillerBunny May 16, 2018 cos(150)=−√3 2 sin(150)=1 2 Explanation: First of all, observe that

cos(30)=√3 2

and

sin(30)=1 2

are known values.