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