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A building that is 225 feet tall casts a shadow of various lengths as the day goes by. An angle of elevationis formed by lines

A building that is 225 feet tall casts a shadow of various lengths as the day goes by. An angle of elevationis formed by lines from the top and bottom of the building to the tip of the shadow, as seen in the figure above. Find the rate of change of the angle of elevationddxddxwhenx=259

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