1.   Express as a trigonometric function of an angle in Quadrant I.
    A. B.
    C. D.
    Hint

  2.   If csc = 2, find sin .
    A. B.
    C. D. 2
    Hint

  3.   Determine the exact value of cos, given sin and 0° < < 90°
    A. B.
    C. D.
    Hint

  4.   Express cot (-840°) as a trigonometric function of an angle in Quadrant I.
    A. cot 60° B. tan 60°
    C. - cot 60° D. - tan 60°
    Hint

  5.   Which of the following is a valid trigonometric identity.
    A. tan2 + cot2 = sin cos
    B. tan + cot = sec csc
    C. Tan2 + cot2 = sec csc
    D. tan + cot = sin cos
    Hint