Directions: Do NOT use your calculator for these problems. Choose the best answers.

1.
The value of cos 390º is equal to the value of

Choose:
 sin 30º sin 60º -sin 30º -sin 60º

2.
Write cos 280º as a positive acute angle.

Choose:
 cos 10º cos 20º cos 80º cos 85º

3.
Write tan(-110º) as a positive actue angle.

Choose:
 tan 10º tan 20º tan 30º tan 70º

4.
Give an exact value for .

Choose:
 1 2 1/2 -1/2

5.
If θ is an angle in standard position and B(-3,4) is a point on the terminal side of the angle, what is the value of sinθ ?

Choose:
 3/5 -3/5 4/5 -4/5

6.
Find the exact value of secθ for angle θ in standard position if the point (-5,4) lies on its terminal side.

Choose:
 -4/5 -5/4

7.
The line y = 3x creates an acute angle θ when it crosses the x-axis. Find the exact value of secθ.

Choose:

8.
A circle centered at the origin has a radius of 13 units. The terminal side of angle θ intercepts the circle in Quadrant II at point C. The y-coordinate of point C is 5. What is the value of cosθ ?

Choose:
 5/13 -5/13 12/13 -12/13

 9. Draw and label all of the sides and angles of a reference triangle for 150º. The terminal side of the angle will be a segment of length 10 units.

 10. Draw and label all of the sides and angles of a reference triangle for -135º. The terminal side of the angle will be a segment of length 4 units.