Question

Without using a calculator, find the exact value of :
sin210-cos330tan330

Answer 1

start with
\[\sin(210)-\sin(330)\]

Answer 2

But do you get sin(-120) from that?

Answer 3

Nevermind. You don't.

Answer 4

Use Trignometry....

Answer 5

Should I sketch the graph for them? O_o

Answer 6

think of where these points are on the unit circle

Answer 7

one is 60 degrees less than 270, the other is 60 degrees larger than 270, so even without knowing what the answer is, when you add them you must get 0

Answer 8

i mean when you subtract them sorry