This is the 1st time 2 share u my mind,i hope i get good luck with u.
THE SOLUTION WILL BE
we have a=-b-c
,sub. in LHS (a^3+b^3+c^3) we get
= LHS =b^3+c^3-(b+c)^3
b^3+c^3-b^3-3bc^2-3cb^2-c^3=
b-c) 3cb-)=
then,LHS = -3abc


thnx 4 all of u
miko13