What is meant by the amplitude of a trigonometric function?

Feb 11, 2016

The amplitude is the distance from the midline to the maximum or to the minimum (they are the same). For example, $y = \sin \left(x\right)$ has an amplitude of 1 because the midline is $y = 0$ and the max is 1.

This can be found by finding the range of the function and dividing by two. (See if you can figure out why.)