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Source de c-II-d.tex

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$$\vcenter {\offinterlineskip
    \def \cc#1{ \hfil #1 \hfil }
    \halign {
    \tvg \cc {$#$}& #\tv & \cc {$#$}&
\cc {$#$}& \cc {$#$}& \cc {$#$}& \cc{$#$} &#\tv\cr
    \noalign {\hrule}
        x&& -\infty&& 4&&+\infty&
    \cr
    \noalign {\hrule}
    f'(x)&&& + & \doublevrule & -&&
    \cr
    \noalign {\hrule}
    \buuucenter {$f(x)$} &&\down {$0$}
    &\bbrightuuparrow \bbuup{$+\infty$} &\doublevrule  &\bbuup{$+\infty$} 
    ~~ \bbrightddownarrow &\down{8}&
    \cr
    \noalign {\hrule}
    }}
$$