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I need help on this question Application: The depth of the water, y, in meters, in the Bay of Fundy, Canada, is given as a

I need help on this question

Application: The depth of the water, y, in meters, in the Bay of Fundy, Canada, is given as a function of time, t, in hours after midnight, by the function y = 10 + 7.5 cos(0.507t). How quickly is the tide rising or falling at 3am

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