Matematické Fórum

Kreslím graf v Geogebre, a potom ho potrebujem dostať do TeXu.
Skopírujem sem zdroják:

\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
%\clip(-4.65,-5.17) rectangle (9.31,6.63);
\draw (-2,-2)-- (-2,6);
\draw (6,-2)-- (-2,-2);
\draw (-4,-2)-- (-2,-2);
\draw (-2,-4)-- (-2,-2);
\draw [samples=50,rotate around={0:(-1.8,-0.37)},xshift=-1.8cm,yshift=-0.37cm] plot (\x,\x^2/2/3.26);
\draw [samples=50,rotate around={-180:(-1.84,4.25)},xshift=-1.84cm,yshift=4.25cm] plot (\x,\x^2/2/3.5);
\draw [dash pattern=on 2pt off 2pt] (2.11,-2)-- (2.13,2);
\draw [dash pattern=on 2pt off 2pt] (-2,2)-- (2.13,2);
\draw (0.75,4.11) node[anchor=north west] {};
\draw (0.15,0.57) node[anchor=north west] {};
\draw (-2.59,5.99) node[anchor=north west] {};
\draw (5.59,-1.99) node[anchor=north west] {};
\draw (1.95,-1.99) node[anchor=north west] {};
\draw (-2.67,2.47) node[anchor=north west] {};
\draw (-2.49,-1.99) node[anchor=north west] {};
\draw [->] (-2,-2) -- (-2,6);
\draw [->] (-2,-2) -- (6,-2);
\draw (-2.55,4.65) node[anchor=north west] {};
\draw (4.65,-1.99) node[anchor=north west] {};
\draw (-0.89,2.97) node[anchor=north west] {};
\draw (-1.17,1.15) node[anchor=north west] {};
\begin{scriptsize}
\fill [color=black] (2.13,2) circle (1.5pt);
\fill [color=black] (-2,-2) circle (1.5pt);
\end{scriptsize}
\end{tikzpicture}

Ako mám upraviť tie paraboly, aby mi ich vykresľovalo len v prvom kvadrante?
A dá sa v geogebre nejak vyšrafovať časť grafu?
Ďakujem.