Exercises 8.1, page 243

  1. 1.

    1.  −  ,   +  ,   −  ,   −  ,   +  ,   − 

    2.  +  ,   −  ,   +  ,   +  ,   +  ,   − 

  2. 3.  −  ,   + 

  3. 5.  −  ,   − 

  4. 7.  +  ,   + 

  5. 9.  −  ,   + 

  6. 11.  +  ,   − 

  7. 13.  −  ,   + 

  8. 15.  +  ,   + 

  9. 17.

    sin θ = 15 ,  cos θ = 25 ,  tan θ = 12 ,  cot θ = 2 , sec θ = 125 ,  csc θ = 5

  10. 19.

    sin θ =  − 313 ,  cos θ =  − 213 ,  tan θ = 32 ,  cot θ = 23 , sec θ =  − 1213 ,  csc θ =  − 1313

  11. 21.

    sin θ = 1213 ,  cos θ =  − 513 ,  tan θ =  − 125 ,  cot θ =  − 512 , sec θ =  − 135 ,  csc θ = 1312

  12. 23.

    sin θ =  − 229 ,  cos θ = 529 ,  tan θ =  − 25 ,  cot θ =  − 52 , sec θ = 1529 ,  csc θ =  − 1229

  13. 25. I, II

  14. 27. II, IV

  15. 29. II, III

  16. 31. II

  17. 33. II

  18. 35. IV

  19. 37. I

  20. 39. II

  21. 41.  − 

  22. 43.  − 

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