Select the correct answer.
The graph shows the function
y
=
cos
⁡
(
x
)
.

A waveform starts from the y-axis at (0, 1) and passes through (pi, minus 1), (2 pi, 1), and (3 pi, minus 1)

What is the amplitude of the function?

A.

2
B.

1
C.

π
D.

2
⁢
π
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