Question

Which are the coordinates of the terminal point determined by t= (20π/3)?

Question attached below.

Please explain answer. Thank you!

Answer 1

hint:

x = cos(t)
y = sin(t)


(x,y) in this case is on the unit circle.

Answer 2

ok so do I take the cos of 20pi and sin of 3?

Answer 3

x = cos(20pi/3) = ??
y = sin(20pi/3) = ??

Answer 4

ok so cos=-1/2 and sin √3/2 that would make the answer A. (-1/2, √3/2)?

Answer 5

correct

Answer 6

thanks again :)

Answer 7

np