The water depth in a narrow channel varies with the tides. The depth of the channel is deepest at the high tide that occurs at 2 AM in the morning when it is 12 ft. The channel is lowest at low tide, which occurs at 2 PM, when the depth is 5.4 ft. If t represents the hours after midnight, find a cosine model for the depth, D(t), of the channel (in feet) as a function of time. D(t) -

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