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The height of water in a harbour, h m, is modelled by the function h(t) = 4+3sin(30t) where t is the time, in hours, after

The height of water in a harbour, h m, is modelled by the function h(t) = 4+3sin(30t) where t is the time, in hours, after midnight. It is safe for a ship to enter the harbour when h 2 5 m For 0 St

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