Subject: trig problem

Please help! I have attached a diagram of the graph, and I need to find out its period. I really don't understand how to do so, please help!


The period of a periodic function, which is the "shortest repeating interval", is sometimes difficult to identify if all you have is a diagram. I expect that in this situation the period is what I have marked in the diagram below.

If the point indicated by the black dot has coordinates (pi,2) then the red dots are approximately evenly spaced, about pi/3 units apart. Thus the period is 4/3 pi.



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