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Trigonometry: Describe the Variation in Water Level as a Function.

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Please help me with this trigonometry question:

The graph shows the variation of the water level relative to mean sea level in Commencement Bay at Tacoma, Washington, for a particular 24-hour period. Assuming that this variation is modelled by simple harmonic motion, find an equation that describes the variation in water level as a function of the number of hours after midnight.

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