4: %% Test with echo off
4: off echo ;
5: 
      2            2
a := x  + 2*x*y + y

6: 
ax := 2*(x + y)

7: 
ay := 2*(x + y)

8: 
=====> submit number 1 done <=====

9: 9: 9: 

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: mark_end_block(2) ;
=====> submit number 2 done <=====


14: c:=(u+v)^4 ;
      4      3        2  2        3    4
c := u  + 4*u *v + 6*u *v  + 4*u*v  + v


15: cu:=df(c,u) ;
          3      2          2    3
cu := 4*(u  + 3*u *v + 3*u*v  + v )


16: cv:=df(c,v) ;
          3      2          2    3
cv := 4*(u  + 3*u *v + 3*u*v  + v )


17: mark_end_block(3) ;
=====> submit number 3 done <=====


18: 

