The Bay of Calculus in Canada is reputed to have the largest tides in the world. The difference between low?

Question

and high water levels is 200 levels is 200 feet. Suppose at midnight Jan 1, the depth of the water is 900 feet. High tide is at 6am. Given a formula of water y as a function by
y = D + Acos ( B ( t - C ) ).

What is the value of A, B, C, D?

Answer 1

y = 1,000 + 100cos ( (π/12) ( t - 6 ) ).