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A runner sprints around a circular track of radius at a constant speed of . The runner’s friend is standing at a distance from the center of the track. How fast is the distance between the two friends changing when the distance between them is ?
Explain the difference between an absolute minimum and a local minimum.
at a constant speed of 
. The runner’s friend is standing at a distance 
from the center of the track. How fast is the distance between the two friends changing when the distance between them is 
