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13 An aeroplane passes directly overhead, then flies horizontally away from an observer with altitude of 5000 m and air speed 200 ms . At
13 An aeroplane passes directly overhead, then flies horizontally away from an observer with altitude of 5000 m and air speed 200 ms . At what rate is its angle of elevation to the observer changing at the instant when the angle of elevation is: a 60 b 30? rate of
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