An airplane flies at an altitude of  y = 4  miles toward a point directly over an observer (see figure). The speed of the plane is 600 miles per hour. Find the rates at which the angle of elevation ? is changing when the angle is  ? = 45°,   ? = 60°,  and  ? = 80°.   (a)    ? = 45°   rad/min (b)    ? = 60°   rad/min (c)    ? = 80° (Round your answer to two decimal places.)   rad/min

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