Exemplo:
Converted by
Mathematica
June 8, 2001
![[Graphics:../Images/Pratica6_gr_70.gif]](../Images/Pratica6_gr_70.gif)
![[Graphics:../Images/Pratica6_gr_71.gif]](../Images/Pratica6_gr_71.gif)
![[Graphics:../Images/Pratica6_gr_72.gif]](../Images/Pratica6_gr_72.gif)
![[Graphics:../Images/Pratica6_gr_73.gif]](../Images/Pratica6_gr_73.gif)