Find the exact value of each of the following. In each case, show your work and explain the steps you take to find the value.

1. sin

2. tan

3. sec

I am not sure how to approach this. I looked at the unit circle and know that all three of these go around the circle almost once or one time. Do I have to look at the reference angles for this? Also how does sin, tan and sec affect the answer?

I know tan (theta)=y/x, sec(theta)= 1/x and sin(theta)= y.

Thanks.