Quiz(2) trigonometric functions and the unit circle(1)

A point is in Quadrant-III and on the Unit Circle. If its x-coordinate is -4 / 5, what is the y-coordinate of the point?

Find the point on the Unit Circle associated with the rotation -9π/2

If point (a , b) is on the Unit Circle associated with the rotation t, which of the following is not correct?

If point (a , b) is on the Unit Circle associated with the rotation t and point (c , d) is also on the Unit circle associated with rotation t + π, then which of the following is correct?

Based on your unit circle cos(0^o) =

In your unit circle sin(90^o)=

tangent is

When does sin(x)=0 ?

In the unit circle: What is the length in radians of the arc of the circle from $0\degree$  to  $120\degree$  

In the unit circle cos(90 $\degree$ )=