1.   If sin = and has its terminal side in the first quadrant, find the exact value of cos 2.
    A. 1 B.
    C. D.
    Hint

  2.   Complete the identity = ________.
    A. sin x B. cot x
    C. cos x D. tan x
    Hint

  3.   If cos = and has its terminal side in the first quadrant, find the exact value of sin 2.
    A. B.
    C. 2 D.
    Hint

  4.   If cos = and has its terminal side in the first quadrant, find the exact value of cos .
    A. - B. -
    C. D.
    Hint

  5.   Use a half-angle identity to find the exact value of tan .
    A. B.
    C. - D. -
    Hint