10: b:=(u+v)^3 ;
      3      2          2    3
b := u  + 3*u *v + 3*u*v  + v
11: bu:=df(b,u) ;
          2            2
bu := 3*(u  + 2*u*v + v )
12: bv:=df(b,v) ;
          2            2
bv := 3*(u  + 2*u*v + v )
13: write "=====> submit number ", 2, " done <=====" ;
=====> submit number 2 done <=====
