Suppose there are 3 different curves.(adsbygoogle = window.adsbygoogle || []).push({});

How do I determine if they have the same period? I am aware of how to calculate period but how do we determine if they have the same period graphically?

1) what is the idea behind x(t) = x(t+T)?

2) must all 3 curves cuts a particular horizontal at the same time?

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# Determining if 3 curves have the same period

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