What is the amplitude of y = 4 cos 3x?

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The amplitude is 4

Step-by-step explanation:

Recall that the amplitude of a harmonic form like this one based on the cosine function is the absolute value of the coefficient that multiplies the function. In our case that coefficient is 4.

So the amplitude of this function is "4".

the amplitude is 4

Step-by-step explanation:

'Y' varies between - 4 and + 4. Viewed as a wave, its amplitude is

4.