The amplitude of y = -4cos(2x) would be 4.
The amplitude of the sine and cosine functions exists within the vertical distance between the sinusoidal axis and the maximum or minimum value of the function.
The formula
x = A sin (ωt + ϕ) or x = A cos (ωt + ϕ)
The amplitude of a sinusoidal function exists consistently the absolute value of the value in front of the sin.
|-4| = 4
In the given equation y = -4cos(2x), the A value, exists 4.
Because, amplitude exists in the absolute value of this value, the amplitude of y = -4cos(2x) would be 4.
To learn more about amplitude of the sinusoid
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