(x+y)3 + ( y + z)3 + ( z+x)3 - 3(x+y)(y+z)(z+x) = 2 ( x3 + y3 + z3 - 3xyz)

[Dhanalakshmi]

(x+y)³ + ( y + z)³ + ( z+x)³- 3(x+y)(y+z)(z+x) = 2 ( x³ + y³ + z³ - 3xyz)

[Dhanalakshmi]