The depth in feet of water at a dock changes with the rise and fall of tides The depth is modeled by the function D t 4 sin T t

Question

The depth in feet of water at a dock changes with the rise and fall of tides The depth is modeled by the function D t 4 sin T t 3T 2 where t is the number of hours after midnight Find the rate at which the depth is changing at 1 a m Round your answer to 4 decimal places ft hr

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