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Sine Graph Amplitude

ACTMAT-4EO9F5

Which of the following is an equation of this graph?

A

$ {y=\sin { 3x }} $

B

$ {y=3\sin { x }} $

C

$ {y=\cos { 3x }} $

D

$ {y=3\cos { x }} $

E

$ {y=3\cos { 3x }} $