Math104 Precalculus Trigonometric Functional Values Notes T4.4

I. Signs of the Trig Functions

A

		A
S
			S

T

	T	C
			C

II. Degree and Radian Measures of Special and Quadrantal Angles

III. Special Right Triangles (revisited)

Math104 Precalculus Notes T4.4 page 2

IV. Reference Angles

The reference angle of is:

The reference angle of is:

The reference angle of is:

Examples

1. Find the exact value of all six trig functions at the point (2,-3)

2. If , in quadrant III, find the values of the remaining five trig functions.

Math104 Precalculus Notes T4.4 page 3

IV. Examples (con’t)

3. Find the exact value of tan 270º

4. If , <0, find the values of the remaining five trig functions.

5. Using reference angles, find the exact value of cos 300º

6. Using reference angles, find the exact value of sin (-3π/4)