Question

Prove that (x+y)³+(y+z)³+(z+x)³-3(x+y)(y+z)(z+x)=2(x³+y³+z³).

Answer 1

I want to tell u that solve all cube and u will get answer
(a+b)^3=a^3+b^3+3ab (a+b)

Answer 2

you could get this answer by opening the brackets .then R.H.S=L.H.S. PROVED