You must be able to do this exercise first.

1. If Acos θ = 0, then θ =
   (two answers, find them both)

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

2. If Acos θ = A, then θ =
   (two answers; find them both)

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

3. If 2Acos (4πt) = A, then 4πt =

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

4. If 6cos(2πt) = 0, then 2πt =
   (multiple answers, find them both)

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

5. If Acos θ = - A, then θ =

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

6. If Acos θ = A/2, then θ =

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

7. If 2Acos (4πt) = 0, then 4πt =
   (Two answers, find them both)

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

8. If 6cos(2πt) = -6, then 2πt =

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

9. If 2Acos (4πt) = -2A, then 4πt =

   1.   ?    0
   2.   ?    π/3
   3.   ?    π/2
   4.   ?    π
   5.   ?    3π/2
   6.   ?    2π

10. If 6cos(2πt) = 6, then 2πt =
    (two answers; find them both)

    1.   ?    0
    2.   ?    π/3
    3.   ?    π/2
    4.   ?    π
    5.   ?    3π/2
    6.   ?    2π

11. If 6cos(2πt) = 3, then 2πt =

    1.   ?    0
    2.   ?    π/3
    3.   ?    π/2
    4.   ?    π
    5.   ?    3π/2
    6.   ?    2π

12. If 2Acos (4πt) = 2A, then 4πt =
    (two answers, find the both)

    1.   ?    0
    2.   ?    π/3
    3.   ?    π/2
    4.   ?    π
    5.   ?    3π/2
    6.   ?    2π