cfiandra” post=97433
Se riesci a postare il codice di una delle figure sarebbe un ottimo punto di partenza.
Ecco qui:
`\begin{tikzpicture}[font=\small]
\begin{axis} [width=0.55\textwidth,
axis lines=middle,
xmin=-1.6,xmax=1.6,ymin=-1,ymax=4,
enlargelimits,
xtick={-1.414,-1,-0.577,0.577,1,1.414},
xticklabels={$-\sqrt{2}$,$-1$,,,$1$,$\sqrt{2}$},
ytick={-1},
xlabel=$x$,
ylabel=$y$]
% minimi
\draw [dashed] (axis cs:1,0) — (axis cs:1,-1);
\draw [dashed] (axis cs:1,-1) — (axis cs:0,-1);
\draw [dashed] (axis cs:-1,0) — (axis cs:-1,-1);
\draw [dashed] (axis cs:-1,-1) — (axis cs:0,-1);
\addplot [domain=-2:2, samples=200, restrict y to domain=-30:30,smooth,grafico] {x^4-2*x*x};
\pattern [pattern= north east lines, pattern color=lightgray] (axis cs:1.414,-6) rectangle (axis cs:4,0);
\pattern [pattern= north east lines, pattern color=lightgray] (axis cs:-1.414,0) rectangle (axis cs:1.414,6);
\pattern [pattern= north east lines, pattern color=lightgray] (axis cs:-1.414,0) rectangle (axis cs:-4,-6);
\draw [dashed] (axis cs:1.414,-6) — (axis cs:1.414,6);
\draw [dashed] (axis cs:-1.414,-6) — (axis cs:-1.414,6);
% zeri
\draw (axis cs:1.414,0) [blue,fill=blue,very thick] circle (2.0pt);
\draw (axis cs:-1.414,0) [blue,fill=blue,very thick] circle (2.0pt);
\draw (axis cs:0,0) [blue,fill=blue,very thick] circle (2.0pt);
% minimi
\draw (axis cs:1,-1) [blue,fill=blue,very thick] circle (2.0pt);
\draw (axis cs:-1,-1) [blue,fill=blue,very thick] circle (2.0pt);
% flessi
\draw (axis cs:0.577,-0.556) [blue,fill=blue,very thick] circle (2.0pt);
\draw (axis cs:-0.577,-0.556) [blue,fill=blue,very thick] circle (2.0pt);
% minimi
\node [below] at (axis cs:1,-1) {$\min$};
\node [below] at (axis cs:-1,-1) {$\min$};
\node [above] at (axis cs:0,0) {$\max$};
% flessi
\node [above] at (axis cs:0.577,-0.556) {$\flex$};
\node [above] at (axis cs:-0.577,-0.556) {$\flex$};
\end{axis}
\end{tikzpicture}`
I vostri suggerimenti sono più che benvenuti!