# How do you find the period, amplitude and sketch #y=-3cos4x#?

##### 1 Answer

Jan 25, 2017

When given an equation of the form:

Amplitude is : |A|

Period is:

Phase shift is:

Vertical shift is: D

#### Explanation:

For the given case

The amplitude is the absolute value of A, |-3| = 3

The period is: