The pH of a water supply oscillates between 7.2 and 7.8. It takes 2 days for the pH to go from 7.2 to 7.8 and 2 days for the pH to go from 7.8 to 7.2. Express the pH as a function of time in the form y = A sin[B (x − C)] + D where the pH is 7.2 on day 13. Graph one cycle of the function.
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