Question

Find each value by referring to the graph of the sine or cosine function.

cos(pi)

Answer 1

have you been taught the unit circle?

Answer 2

I have, but it's been a while..

Answer 3

@haleyelizabeth2017 use the unit circle to find the angle pi

then look at the x coordinate of the corresponding point

x = cos(theta)
y = sin(theta)

Answer 4

Okay

Answer 5

-1

Answer 6

the points are ordered (cos,sin) so at pi, look at the ordered pair.

Answer 7

Where would 3/2 pi be?

Answer 8

270 degrees?

Answer 9

yes 3pi/2 radians = 270 degrees

this is the direction facing completely south

Answer 10

Which sin (3/2pi)=-1 as well

Answer 11

yep

Answer 12

Where would -7/2pi be?

Answer 13

add 2pi to that angle. What do you get?