# How do you find the domain & range for -3 cos x?

##### 1 Answer

Feb 24, 2017

Domain:

Range:

#### Explanation:

The domain is all the valid input values. Since cosine is a periodic function (it repeats), the domain is all real values:

The

The negative sign in front of the amplitude says that the wave is reversed. This means instead of

Graph of

graph{-3cos(x) [-10, 10, -5, 5]}