Period of a Periodic Function is the horizontal distance required for the graph of that periodic function to complete one cycle.
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The frequency of a periodic function is 1/Period
2PI
Yes, the sine function is a periodic function. It has a period of 2 pi radians or 360 degrees.
2pi
The period of a trigonometric function, since it depends on the angle of a ray centered in a unit circle, is 2 pi radians or 360 degrees.