Some functions (such as Sine and Cosine) repeat Eternally and Therefore Are Known as Periodic Functions. The period goes from 1 peak to another one (or from any point to another fitting point). The Amplitude is that the Elevation from the middle line to the peak (or into the trough). Also we can measure the height from highest to lowest points. Then divide that by 2. So, **How to find amplitude?**

The formal way to say this for any periodic function is:

Lets suppose you know that the maximum value of y=sin x or y=cos x is 1 and the minimum value of either is -1. So if you applied the above definition, you would get:

## How to find amplitude?

So, lets see some examples

- What is the amplitude of y(t) = 1.5cos(t)?

For this example, the value of the amplitude multiplier A is given by 1.5, so the exmaple will have an amplitude of:

1.5 = 3/2 - What is the amplitude of y(x) = –1cos(x)?

For this example, the value of the amplitude multiplier A is –1, so the amplitude is:1

. . .and, incidentally, the chart would also be flipped upside down, due to this”minus” sign.

Technically, the amplitude is that the complete value of everything is multiplied over the trig function. The amplitude only says “tall” or “brief” the curve is; it is your choice to notice if there is a”minus” on this particular multiplier, and consequently whether the purpose is at the customary orientation, or upside-down.

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