1. y x r
(a, b)

2. provided no denominator equals 0.

3. Find the exact value of each of the six trigonometric functions of a positive angle if (-2, 3) is a point on the terminal side. y
(-2, 3) x

5. y x
P= (1, 0)
P= (a, b)

6. 90o ?
a = 0
b = 1
r = 1

8. y
a > 0, b > 0, r > 0
a < 0, b > 0, r > 0 x r
(a, b)
a < 0, b < 0, r > 0
a > 0, b < 0, r > 0

9. y
I (+, +)
All positive x

10. Let denote a nonacute angle that lies in a quadrant
Let denote a nonacute angle that lies in a quadrant. The acute angle formed by the terminal side of and either the positive x-axis or the negative x-axis is called the reference angle for

11. Reference Angle

12. y x

13. Find the exact value of each of the following trigonometric functions using reference angles: