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c-d.tex

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$$\vcenter {\offinterlineskip
    \def \cc#1{ \hfil #1 \hfil }
    \halign {
    \tvg \cc {$#$}& #\tv & \cc {$#$} & \cc {$#$}& \cc {$#$}&
\cc {$#$}& \cc {$#$} &#\tv\cr
    \noalign {\hrule}
        x&& 0&& 2&& +\infty&
    \cr
    \noalign {\hrule}
    f'(x)&&& +& 0& -&&
    \cr
    \noalign {\hrule}
    \buuucenter {$f(x)$} &&\down{1} &\bbrightuuparrow & \bbuup {$e^3$}
    &\bbrightddownarrow &\down {$-2$}&
    \cr
    \noalign {\hrule}
    }}
$$