c-d-II-c.tex

$$\vcenter {\offinterlineskip
    \def \cc#1{ \hfil #1 \hfil }
    \halign {
    \tvg \cc {$#$}& #\tv & \cc {$#$} & \cc {$#$}& \cc {$#$}&
\cc {$#$}& \cc {$#$}& \cc {$#$}& \cc{$#$} &#\tv\cr
    \noalign {\hrule}
        x&& 0&& 2&& 4&&+\infty&
    \cr
    \noalign {\hrule}
    f'(x)&&& +& 0& - & \doublevrule & +&&
    \cr
    \noalign {\hrule}
    \buuucenter {$f(x)$} &&\down{1} &\bbrightuuparrow & \bbuup {$e^3$}
    &\bbrightddownarrow -\infty &\doublevrule  &-\infty 
    ~~ \bbrightuuparrow & \bbuup{8}&
    \cr
    \noalign {\hrule}
    }}
$$