Exercises 8.2, page 248

  1. 1.

    sin 200 °  =   − sin 20 °  =  − 0.3420 , tan 150 °  =   − tan 30 °  =  − 0.5774 , cos 265 °  =   − cos 85 °  =  − 0.0872 , cot 300 °  =  − cot 60 °  =  − 0.5774 ,  sec 344 °  = sec 16 °  = 1.040 , sin 397 °  =  sin 37 °  = 0.6018

  2. 3. sin 25 °  ;  − cos 40 ° 

  3. 5.  − tan 75 °  ;  − csc 32 ° 

  4. 7. sec 65 °  ;  − sin 20 ° 

  5. 9.  − sin 15 °  =  − 0.26

  6. 11.  − cos 73.7 °  =  − 0.281

  7. 13. sec 31.67 °  = 1.175

  8. 15. tan 70.9 °  = 2.89

  9. 17. 0.459

  10. 19.  − 0.7620

  11. 21.  − 3.910

  12. 23.  − 0.6188

  13. 25. 237.99 °  ,  302.01 ° 

  14. 27. 66.40 °  ,  293.60 ° 

  15. 29. 91 °  ,  271 ° 

  16. 31. 119.5 ° 

  17. 33. 263 ° 

  18. 35. 312.94 ° 

  19. 37. 299.24 ° 

  20. 39. 0.5

  21. 41.  − 1

  22. 43.  − 0.7003

  23. 45.  − 0.777

  24. 47.  < 

  25. 49.  = 

  26. 51.  − 0.9659

  27. 53. cot θ

  28. 55. 0

  29. 57. 0.0183 A

  30. 59. 12.6 in.

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