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11. A plane flies horizontally at an altitude of 8 miles and passes directly over a tracking station on the ground. How fast is the

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11. A plane flies horizontally at an altitude of 8 miles and passes directly over a tracking station on the ground. How fast is the plane flying if the angle of elevation (angle from ground to plane) is decreasing at a rate of 1/2 radian/minute when the angle is 45 degrees. (12 pts)

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