How do you graph $y=-3cosx$ ?

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Answer 1 · 2016-10-18T11:45:11

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

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

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

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

How do you graph y=-3cosxy=-3cosx?