\begin{frame}
  \frametitle{2nd Midterm Exam - Review}

  \begin{exampleblock}{}
    Evaluate the limit
    \begin{align*}
      \lim_{x\to \infty} (x\cdot \sin(\frac{1}{x}))
    \end{align*}
    We have
    \begin{align*}
      \lim_{x\to \infty} (x\cdot \sin(\frac{1}{x}))
      \stackrel{\mpause[1]{\text{take $h=\frac{1}{x}$}}}{=} \mpause[1]{\lim_{h\to 0} (\frac{1}{h}\cdot \sin(h))}
      \mpause[2]{= 1}
    \end{align*}
  \end{exampleblock}
\end{frame}