A car starts off 21 miles directly east from the city of Johnstown. It travels due north at a speed of 39 miles per hour. After travelling 47 miles, how fast (in radians per hour) is the angle opposite the northward path (θ) changing?

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should have been evaluated with one odd value and one even value. the expressions have equivalent values when . when , the first expression has a value of 3 and the second

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