
Considere o grfico da funo $f$: 

\begin{asy}
import graph;
size(200,IgnoreAspect);



real f(real x) {return (x<0)?4:2+x;}

real g(real x) {return 2+x;}

draw(graph(f,-3,-0.08));

draw(circle((0,4),.1));
draw(graph(g,0,3));
dot((0,2));

xaxis("$x$",xmin=-3,xmax=3,LeftTicks,EndArrow);
yaxis("$y$",ymin=0,ymax=6,RightTicks,EndArrow);
\end{asy}

$\displaystyle \lim_{x\rightarrow 0^-} f(x)$
\begin{enumerate}pyB
subst = [" 4"," 2",r" $\sqrt 2$", "no existe"]
unsorted = shuffle( subst )
certa[0] = unsorted[0]
opts = unsorted[1]
for i in opts:
    emit( "\n\\item ", i)
pyE
\end{enumerate}