Seja $g(x)=x\cos {(3x)}$. O valor de $g'(\pi/4)$  \begin{enumerate}pyB
subst = [r"$\displaystyle -\frac{\sqrt 2}{2}-\frac{3\pi}{4}\frac{\sqrt{2}}{2}$",r"$\displaystyle -\frac{\sqrt 2}{2}-\frac{\pi}{4}\frac{\sqrt{2}}{2}$",r"$\displaystyle -\frac{\sqrt 2}{2}$","0"]
unsorted = shuffle( subst )
certa[0] = unsorted[0]
opts = unsorted[1]
for i in opts:
    emit( "\n\\item ", i)
pyE
\end{enumerate}