Inicial.
Converted by
Mathematica
June 17, 2001
![[Graphics:../Images/Pratica7_gr_1.gif]](../Images/Pratica7_gr_1.gif)
![[Graphics:../Images/Pratica7_gr_2.gif]](../Images/Pratica7_gr_2.gif)
![[Graphics:../Images/Pratica7_gr_3.gif]](../Images/Pratica7_gr_3.gif)