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

  \begin{exampleblock}{}
    Find the derivative of
    \begin{align*}
      f(x) = \frac{8e^x}{e^x + 1}
    \end{align*}
    \pause
    We have:
    \begin{align*}
      f'(x) 
      &= \mpause[1]{ \frac{(e^x + 1) \cdot \frac{d}{dx} (8e^x) - 8e^x \cdot \frac{d}{dx} (e^x + 1)}{(e^x + 1)^2} } \\
      &\mpause[2]{=  \frac{(e^x + 1) \cdot 8e^x - 8e^x \cdot e^x}{(e^x + 1)^2} } \\
      &\mpause[3]{=  \frac{8e^x}{(e^x + 1)^2} } 
    \end{align*}
  \end{exampleblock}
\end{frame}