Question

How do I find the sine, cosine, and tangent of a real number without being given its points on the unit circle?

Answer 1

what are you given?

Answer 2

-7pi/3

Answer 3

find the angle corresponding to \(-\frac{7\pi}{3}\) on the unit circle
then look at the coordinates

Answer 4

7pi/3 isn't on the unit circle... There is 7pi/6 and 7pi/4... but i cant find 7pi/3.

Answer 5

That's more than a full rotation around the circle :)
Add or subtract 2pi from 7pi/3.
That should give you a nice reference angle to work with.

Answer 6

Alrightttttt... Just figured it out. Thank you!