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20. In one location of the Bay of Fundy, the height of the tides, h, in metres, can be modelled by the function/ = 6

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20. In one location of the Bay of Fundy, the height of the tides, h, in metres, can be modelled by the function/ = 6 sin (#- 2) + 8, where t is the time, in hours. Determine the formula for the rate of change of the height of the tides at time t. [5 Marks]

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