The depth (in feet) of water at a dock changes with the rise and fall of tides. The depth is modeled by the function 7
The depth (in feet) of water at a dock changes with the rise and fall of tides. The depth is modeled by the function 7 7 D(t) = 2 cos + 3 3 3 where t is the number of hours after midnight. Find the rate at which the depth is changing at 4 a.m. Round your answer to 4 decimal places
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