Simplify: (a+b+c)2−(a2+b2+c2)(a+b+c)^2 - (a^2+b^2+c^2)(a+b+c)2−(a2+b2+c2).
2(ab+bc+ca)2(ab+bc+ca)2(ab+bc+ca)
2(a+b+c)2(a+b+c)2(a+b+c)
ab+bc+caab+bc+caab+bc+ca
000