Find the amplitude, period, and phase shift of the function. Graph the function. Be sure to label key points. Show at least two periods.
\[
y=6 \cos \left(4 x+\frac{\pi}{2}\right)
\]
What is the amplitude?
(Simplify your answer. Type an exact answer, using $\pi$ as needed. Use integers or fractions for any numbers in the expression.)

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The amplitude of the function is the absolute value of the coefficient of the cosine function. In this case, the coefficient is 6, so the amplitude is $\boxed{6}$.

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Step 1 ：The amplitude of the function is the absolute value of the coefficient of the cosine function. In this case, the coefficient is 6, so the amplitude is $\boxed{6}$.

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