Question

Find (without using a calculator) the exact value of the expression.
sin 150° − cos 330° tan 150°

Answer 1

What is the reference angle of a 150deg angle?

Answer 2

30deg ?

Answer 3

Yep and what is sin 30?

Answer 4

What quadrant is 150deg in?

Answer 5

sin30 =1/2

Answer 6

2nd quadrant.

Answer 7

Is sin po or neg in 2nd quad?

Answer 8

positive .

Answer 9

Right so what is sin 150deg?

Answer 10

+1/2

Answer 11

Ohhhh, i get it now :) thanks alot @Paynesdad

Answer 12

Ok now lets move on to tan 150. What is tan of 30?

Answer 13

My pleasure!

Answer 14

radicand 3 over 3

Answer 15

Yep and what is tan in 2nd quad?

Answer 16

negative :)

Answer 17

So what is tan 150?

Answer 18

-radicand 3 over 2

Answer 19

you mean over 3 right?

Answer 20

yeah, anyways, i've finally got it, so thanks anyways ! :)

Answer 21

No prob glad to help