In Shadow Bay in July, high tide is at 1:30 pm. The water level is 4 feet at high tide and 0 feet at low tide. Assuming the next high tide is exactly 12 hours later and the height of the water can be modeled by a cosine curve, find an equation for Shadow Bay's water level in July as a function of time (t).
f (t) = 2 cos pi over 6 t + 1
f (t) = 2 cos pi over 6 t + 2
f (t) = 4 cos pi over 2 t + 1
f (t) = 4 cos pi over 2 t + 2
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