# How do you graph y=-3cosx?

Oct 18, 2016

graph{-3cosx [-10, 10, -5, 5]}

#### Explanation:

The graph of $y = \cos x$ is as follows:
graph{cosx [-10, 10, -5, 5]}

The graph of $y = 3 \cos x$ is that graph scaled along OY with scale factor 3:
graph{3cosx [-10, 10, -5, 5]}

The graph of $y = - 3 \cos x$ is that graph inverted:
graph{-3cosx [-10, 10, -5, 5]}