The depth (in feet) of water at a dock changes with the rise and fall of tides. The depth is modeled b function T D(t) = 5 sin - ( = ¹ + ²) + -t +2 6 where t is the number of hours after midnight. Find the rate at which the depth is changing at 6 a.m. Round your answer to 4 decimal places. ft/hr

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