Download Math B Term 3

Math B Term 3
2/25/08
Aim: What is a reference angle? How are the trigonometric function values of any angle
related to those of its reference angle?
DO NOW:
Find the trigonometric values to the nearest ten thousandth:
1. tan 240o
5. sin 145o
2. tan 60o
6. sin 35o
3. cos 300o
7. cos (-290o)
4. cos 30o
8. cos 70o
KEY CONCEPT:
1. The acute angle that the terminal side of an angle drawn in standard position
makes with the horizontal axis is called its reference angle.
2. The six function values for any angle equal the function values for its reference
angle, give or take a minus sign.
QUICK CHECK:
Find the reference angle of each given angle:
1. 200o
2. 173o
3. 260o
4. 400o
5. -285o
Express the given function as the function of a positive acute angle.
1. sin 240o
2. tan (-100o)
3. sin 320o
4. cos 500o
5. tan 282o
6. cos (-156o)
7. sin (-237o 15’)
8. tan 138o 10’
Homework # 10: Answer # 25-32 on page 660.