An airplane flies at an altitude of 5 miles toward a point directly over an observer (see
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An airplane flies at an altitude of 5 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 θ is changing when the angle is
(a) θ = 30°
(b) θ = 60°
(c) θ = 75°
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