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\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}