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\begin{frame}
  \frametitle{Limits at Infinity}
  
  \begin{center}
    \scalebox{.7}{
    \begin{tikzpicture}[default,yscale=.8]
      \diagram{-7}{7}{-2}{2}{1}
      \diagramannotatez
      \diagramannotatexx{-pi/$-\pi$,pi/$\pi$}
      \diagramannotateyy{{-0.5*pi}/$-\frac{\pi}{2}$,{0.5*pi}/$\frac{\pi}{2}$}
      \draw[cgreen,ultra thick] plot[smooth,domain=-7:7,samples=50] function{atan(x)};
      \draw[cred,dashed] (-7,-0.5*pi) -- (7,-0.5*pi);
      \draw[cred,dashed] (-7,0.5*pi) -- (7,0.5*pi);
    \end{tikzpicture}
    }
    The graph of $\tan^{-1}$.
  \end{center}

  \begin{exampleblock}{}
    Evaluate 
    \begin{talign}
      \lim_{x\to 2+} \tan^{-1} \left(\frac{1}{x-2}\right) = 
      \mpause[1]{\lim_{x\to \infty} \tan^{-1} x =} 
      \mpause[2]{\frac{\pi}{2}}
    \end{talign}
    \pause\pause
  \end{exampleblock}
\end{frame}