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How do i find the phase shift in this problem

Naturalists find that the populations fo some kinds of predatory animals vary periodically. Assume that the population of foxes in a certain forest varies sinusoidally with time. Records started being kept when time t = 0 years. A minimum number, 200 foxes, occurred when t = 2.9 years. The next maximum, 800 foxes, occurred at t = 5.1 years.

2 answers

The time from a minimum to a maximum is 1/2 the period.
So I do I find the phase shift based off this?
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