50. Use the figure below to answer each question. The vertical side of the right triangle cuts the semicircle of radius 5 exactly in half. a 5 a) Which of the following can be used to express @ as a function of a only. a (A) 0(a) = arccos 5+a (B) @(a) = arcsin 5 5+ a (C) @(a) = arctan (D) O(a) = arccot (E) Not enough information b) Which of the following can be used to express b as a function of 0 only. (A) b(0) = 5sec 0 + 5 (B) b(0) = 5csc0-5 (C) b(0) =5cot0-5 (D) b(0) =5 -5sine (E) Not enough information