QUAD II: cos: sin: tan:

SECTION 10-5: COSINES AND SINES
IN QUADRANTS II, III, AND IV
QUAD II:
v
cos:
v
sin:
v
tan:
1
QUAD III:
v
cos:
v
sin:
v
tan:
QUAD IV:
v
cos:
v
sin:
v
tan:
2
EXAMPLES:
A.) Is sin 172˚ positive or negative?
B.) Is cos 285˚ positive or negative?
C.) Find sin 210˚
D.) Find tan 315˚
E.) Find sin -30˚
F.) Find cos -210˚
G.) Find tan -300˚
H.) Find cos 495˚
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I.) Find cos 570˚
J.) Find sin 660˚
K.) Is sin 60˚= -sin 120˚?
L.) Is cos 45˚= -cos -45˚?
M.) Is sin 30˚= sin 210˚?
N.) Is cos 45˚= sin 225˚?
1. Is cos 250˚ positive or negative?
2. Is cos 30˚= -cos 150˚?
3. Is sin 60˚= -sin 300˚?
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4. Find sin (240˚)
5. Find cos 150˚
6. Find sin 315˚
7. Find cos (-45˚)
8. Find tan -135˚
9. Find cos -60˚
10. Find sin (-660˚)
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