Question

Use the unit circle to determine exact values of the primary trigonometric ratios for each angle. 1) 2pie/3 (Answer sin 2pie/3 = 3sqroot/2) Not sure how to do this

Answer 1

Do you have a unit circle there in front of you?

Answer 2

No

Answer 3

You need one to do this problem.
Here's one: http://www.regentsprep.org/regents/math/algtrig/ATT5/600px-Unit_circle_angles_svg.jpg
Seen it before?

Answer 4

Yess I have seen that before

Answer 5

ok. sin(angle) = y-coordinate / 1
What is the y-coordinate of the point for the angle 2pie/3 ?

Answer 6

I honestly don't know

Answer 7

Just read it right off of the chart. You see 2pi/3 on the chart?

Answer 8

oh yes, where it says 120 degrees

Answer 9

(-1/2, 3sqroot/2)

Answer 10

yes! You can use that x and y to get all of the trig functions.
sin.....y / 1
cos....x /1
tan....y/x

Answer 11

soo sin would be y/1, so 3sroot/2

Answer 12

then cos is x/1, sooo -1/2

Answer 13

oh I get it, wow thanks :) I'll print that sheet out