91Ó°ÊÓ

If a sound wave is represented by \(y=0.006 \cos (1000 \pi t) \mathrm{cm},\) what are its amplitude and frequency? See Exercise 99.

In Exercises \(111-114\), determine whether each statement is true or false. ( \(A\) and \(B\) are positive real numbers.) The graph of \(y=A \sin (-B x)\) is the graph of \(y=A \sin B x\) reflected about the \(x\) -axis.

What is the amplitude of the function \(y=\sqrt{3} \cos x-\sin x ?\) Use a graphing calculator to graph \(Y_{1}=\sqrt{3} \cos x, Y_{2}=\sin x\) and \(Y_{3}=\sqrt{3} \cos x-\sin x\) in the same viewing window.