Please help! Last Precalc/Trig problem I'm having trouble with :/ Please click attached

Question

anonymous · Answer

attachment

anonymous · Answer

i got D not 100% sure of myself tho

anonymous · Answer

Find the values of cos(210) and sin(210)..

anonymous · Answer

i just multiplied the 2 with the values of cos and sin

anonymous · Answer

lol forgot this isnt my question

anonymous · Answer

-.866 and -.5

anonymous · Answer

$$\cos(210) = \cos(180 + 30) = -\cos(30) = -\frac{\sqrt{3}}{2}$$

anonymous · Answer

use the unit circle

anonymous · Answer

$$\sin(210) = \sin(180 + 30) \implies - \sin(30) \implies - \frac{1}{2}$$

anonymous · Answer

Now I think you can do..

Just multiply 2 with both of them and you will get it..

anonymous · Answer

sqrt3/4

anonymous · Answer

What do you get when you multiply 2 with :
$$2 \times \frac{-\sqrt{3}}{2} = ??$$

anonymous · Answer

Then what is:

$$2 \times \frac{-1}{2} = ??$$

anonymous · Answer

Oh got it! D. Thanks guys :)

anonymous · Answer

memorize the unit circle Ilovecharlie its basically mandatory if you wanna pass trig

anonymous · Answer

Ok. I'll take your advice :)