# How do you find the amplitude and period of #y = cos 4x#?

##### 1 Answer

They can be determined by looking at the coefficients and their location.

#### Explanation:

Let's look at this equation:

The

First,

Second,

For example, the period of cosine is

For your specific question,

NOTE: I wanted to mention to be careful when finding the period of tangent, as the normal period of tangent is