Question

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

Answer 1

i got D not 100% sure of myself tho

Answer 2

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

Answer 3

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

Answer 4

lol forgot this isnt my question

Answer 5

-.866 and -.5

Answer 6

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

Answer 7

use the unit circle

Answer 8

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

Answer 9

Now I think you can do..

Just multiply 2 with both of them and you will get it..

Answer 10

sqrt3/4

Answer 11

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

Answer 12

Then what is:

\[2 \times \frac{-1}{2} = ??\]

Answer 13

Oh got it! D. Thanks guys :)

Answer 14

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

Answer 15

Ok. I'll take your advice :)