Converted by
Mathematica
May 22, 2001
![[Graphics:../Images/Pratica5_gr_29.gif]](../Images/Pratica5_gr_29.gif)
![[Graphics:../Images/Pratica5_gr_30.gif]](../Images/Pratica5_gr_30.gif)
![[Graphics:../Images/Pratica5_gr_31.gif]](../Images/Pratica5_gr_31.gif)
![[Graphics:../Images/Pratica5_gr_32.gif]](../Images/Pratica5_gr_32.gif)