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Source de d-II-c.tex

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