College Algebra & Trigonometry, 2018a

11.4. APPLICATIONS 545
Section 9.1
1. Quadrant I 3. Quadrant IV 5. Quadrant II 7. Quadrant III
9. Quadrant III 11. Quadrant II
Reference Angle: 15 ◦ Reference Angle: 60 ◦
13. Quadrant II 15. Quadrant III
Reference Angle: 45 ◦ Reference Angle: 80 ◦
17. Quadrant IV 19. Quadrant III
Reference Angle: 45 ◦ Reference Angle: π 3
21. Quadrant II 23. Quadrant IV
Reference Angle: π 4
Reference Angle: π 6
25. sin θ = 3 5
tan θ = − 3 4
27. sin θ = −3 √
13
29. cos θ =− √ 55
8
cos θ =− 2 √
13
tan θ =− 3 √
55
31. sin θ = 5 √
26
33. sin θ =− 1 2
cos θ = 1 √
26
cos θ =− √ 3
2
35. sin θ = 1 √
2
cos θ = 1 √
2
tan θ = 1 √
3
tan θ =1
37. sin θ = − √ 3
2
cos θ = 1 2
39. cos θ =− √ 5
3
tan θ = 2 √
5
tan θ = √ 3