The equation of the graph is 3 cos(x).
What is equation of cosine graph?
"A cosine wave is a signal waveform with a shape identical to that of a sine wave , except each point on the cosine wave occurs exactly 1/4 cycle earlier than the corresponding point on the sine wave."
General equation of cosine wave is [tex]Acos(B(x-D)) + C[/tex]
Amplitude of the wave is [tex]3\pi[/tex]
and [tex]B = 2\pi/2\pi = 1[/tex]
So , the equation of wave is [tex]3\cos(x).[/tex]
To know more about cosine wave here
https://brainly.com/question/12598713
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