You are sitting x ft. from a wall and watching a movie screen which is 10 feet high and starts 6 feet above the floor. Your viewing angle is 0 radians. (See the side view diagram below.) 10 ft. 6 ft. x ft. (a) Write your viewing angle 0 as a function of x. [ HINT: Use trigonometry. ] (b) If x is increasing at the rate of 10 ft/min, at what rate is 0 changing when x = 8 ft