Seja $\displaystyle L=\underset{x\rightarrow
0}{\lim}\hspace{.1cm}\frac{x^{3}+x}{3x^{4}+x^{2}+2x}$
\begin{enumerate}pyB
subst=[r"$L=\frac{1}{2}$.",r"$L=+\infty$.",r"$L=\frac{1}{3}$.",r"$L=-\infty$."]
unsorted=shuffle( subst )
certa[0]=unsorted[0]
opts=unsorted[1]
for i in opts:
    emit( "\n\\item ", i)
pyE
\end{enumerate}
