Question:

The rise and fall of the tide is assumed toi be simple harmonic, with the time between  low and high tide begin six hours. The water depth at a harbour entrance at high and low tide are 14 metre,  respectively. If t is the number of hours after low tide, and y the water depth in meter, which equation model this informatiom?

Answer:

amplitude =12 period=12 hours 2πn=12 n=π6 y=b+acos(nt)   y=12-2 cosπ6t 

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