What are the amplitude, period, and midline of a function?

The midline is a horizontal axis that is used as the reference line about which the graph of a periodic function oscillates.

More About MidlineThe equation of the midline of periodic function is the average of the maximum and minimum values of the functionExamples of Midline Figure-1 shows y = sin x and Figure-2 shows y = sin x + 1. The second curve is the first curve shifted vertically up by one unit.

The midline of y = sin x is the x-axis and the midline of y = sin x + 1 is the line y = 1.