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 Mar 14, 2020
 #1
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Look at the point where the curve intersects the y axis (at y = 3).  Now move along to the right until the curve intersects the point y = 3 again for the second time I.e. so the curve has the same slope as at y = 0. The number of x units between these two points represents the period.

 Mar 14, 2020

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