1. Trigonometric Functions: The Unit Circle
Section 4.2

2. Objectives
Find a point on the unit circle given one coordinate and the quadrant in which the point lies.
Determine the coordinates of a point on the unit circle given a point on the unit circle.
State the sign of the sine or cosine value of an angle based on the quadrant in which the terminal side of an angle occurs.
State the sine and cosine values of an angle (measured in radians) where the angles have a
measure of

3. Objectives
Determine the tangent, cotangent, secant, and cosecant values of an angle given a point on the unit circle.
State the sign of the tangent, cotangent, secant, and cosecant value of an angle based on the quadrant in which the terminal side of an angle occurs.
Determine the tangent, cotangent, secant, and cosecant values of an angle (measured in radians) where the angles have a measure of

4. Vocabulary quadrant sine of an angle cosine of an angle
terminal side of an angle
initial side of an angle
tangent of an angle
cotangent of an angle
secant of an angle
cosecant of an angle

5. Unit Circle

6. If the point is on the unit circle in quadrant IV, then find y.

7. If P(t) has coordinates (0. 141, 0
If P(t) has coordinates (0.141, 0.99), find the coordinates of each point indicated below.

8. Find the terminal point P(x, y) on the unit circle determined by the value of

9. If , find the sin(t) and cos(t).

10. If , find the sin(t) and cos(t).

11. If , find the sin(t) and cos(t).

12. Quotient Identities

13. Reciprocal Identites

14. Pythagorean Identity