The cosine function with amplitude 2 and period 6π is given by:
y = 2cos(x/3).
The standard cosine function is given by:
y = Acos(Bx).
In which:
For a cosine function with amplitude 2 and period 6π, we have that A = 2 and B = 1/3, hence:
y = 2cos(x/3).
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