\begin{frame}
  \frametitle{The Substitution Rule: Exercises}
  
  \begin{exampleblock}{}
    \begin{malign}
      \int (x+1)\sqrt{2x+x^2}\, dx &&\text{take $u = \mpause[1]{2x+x^2}$\mpause{, then $u' = 2(1+x)$}}
    \end{malign}
    \pause\pause
  \end{exampleblock}
  \pause

  \begin{exampleblock}{}
    \begin{malign}
      \int (3t + 2)^{2.4}\, dx &&\text{take $u = \mpause[1]{3t+2}$}
    \end{malign}
    \pause
  \end{exampleblock}
  \pause

  \begin{exampleblock}{}
    \begin{malign}
      \int e^x\cos e^x\, dx &&\text{take $u = \mpause[1]{e^x}$}
    \end{malign}
    \pause
  \end{exampleblock}
  \pause

  \begin{exampleblock}{}
    \begin{malign}
      \int \frac{\sin \sqrt{x}}{\sqrt{x}}\, dt &&\text{take $u = \mpause[1]{\sqrt{x}}$\mpause{, then $u' = \frac{1}{2\sqrt{x}}$}}
    \end{malign}
    \pause\pause
  \end{exampleblock}
  \pause

  \begin{exampleblock}{}
    \begin{malign}
      \int \frac{(\ln x)^2}{x} \, dt &&\text{take $u = \mpause[1]{\ln x}$}
    \end{malign}
    \pause
  \end{exampleblock}
  \pause

  \begin{exampleblock}{}
    \begin{malign}
      \int (x^3+3x)(x^2+1)\, dt &&\text{take $u = \mpause[1]{x^3+3x}$\mpause{, then $u' = 3(x^2+1)$}}
    \end{malign}
    \pause\pause
  \end{exampleblock}
\end{frame}