An aircraft is flying horizontally at a constant height of


An aircraft is flying horizontally at a constant height of 4000 ft above a fixed observation point P: At a certain instant the angle of elevation  is 30 and decreasing, and the speed of the aircraft is 300 mph. How fast is  decreasing at this instant? I honestly dont know what to do.

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Mathematics: An aircraft is flying horizontally at a constant height of
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