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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