\begin{frame} \frametitle{Review - Midterm Exam 3} \begin{exampleblock}{} Evaluate the limit \begin{talign} \lim_{x\to0^+} \frac{\cos x}{x} \end{talign} \pause When $x$ approaches $0$ from the right, we have \begin{itemize} \pause \item $\cos x = \pause 1$ \pause \item $x$ is a small positive number \end{itemize} \pause Thus \begin{talign} \lim_{x\to0^+} \frac{\cos x}{x} = \infty \end{talign} \end{exampleblock} \end{frame}