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A hot air balloon rising vertically is tracked by an observer located 4 miles from the lift-off point. At a certain moment, the angle be-

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A hot air balloon rising vertically is tracked by an observer located 4 miles from the lift-off point. At a certain moment, the angle be- tween the observer's line-ofsight and the horizontal is E , and it is changing at a rate of 0.1 radfmin. How fast is the balloon rising at this moment? miles/ min

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