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An airplane flies horizontally at an altitude of 5 km and passes directly over a tracking telescope on the ground. When the angle of elevation is pi/3, this angle is decreasing at a rate of pi/6 rad/min. How fast is the plane traveling at that time? Same rules apply, draw a picture, it will make your life a whole lot easier!
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Good luck! ^.^
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something like that? my brain is fried already.
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