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