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Name _____________________________________________
Algebra II & Trigonometry
A2.A.57
Date ________________________________________
Reference Angles WS
Sketch and use the reference angle for angles in standard position
In 1 – 24, express each given function as a function of a positive acute angle.
1. sin 100
2. cos 150
3. sin 340
4. tan 300
5. cos 190
6. tan 215
7. cos 290
8. tan 145
9. sin 248
10. cos 305
11. sin 200
12. tan 237
13. sin 98
14. tan 345
15. sin 500
16. cos 690
17. tan 620
18. sin 650
19. sin (-20)
20. cos (-200)
21. sin (-340)
22. cos (-250)
23. tan (-80)
24. sin (-158)
In 25 – 48, find each exact function value.
25. sin 150
26. cos 300
27. tan 225
28. cos 240
29. tan 120
30. cos 405
31. sin 495
32. tan 675
33. tan 330
34. sin 240
35. sin 390
36. tan 600
37. cos 570
38. sin (-45)
39. cos (-30)
40. tan (-120)
41. cos (-300)
42. sin (-135)
43. cos 810
44. cos 900
45. - cos 315
46. - sin 135
47. - sin 630
48. - tan 540
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