###### Amplitude, Period, and Midline of Sinusoidal Functions

- The graph of\begin{equation*} y=A\cos x ~~~~\text{or}~~~~ y=A\sin x \end{equation*}has amplitude \(\abs A\text{.}\)
- The graph of\begin{equation*} y=\cos Bx ~~~~\text{or}~~~~ y=\sin Bx \end{equation*}has period \(\dfrac{2\pi}{B}\text{.}\)
- The graph of\begin{equation*} y=k+\cos x ~~~~\text{or}~~~~ y=k+\sin x \end{equation*}has midline \(y=k\text{.}\)