Show that x3+y3+z3−3xyz=(x+y+z)(x2+y2+z2−xy−yz−zx)x^3 + y^3 + z^3 - 3xyz = (x + y + z)(x^2 + y^2 + z^2 - xy - yz - zx)x3+y3+z3−3xyz=(x+y+z)(x2+y2+z2−xy−yz−zx).
Verified by expanding the right side
Cannot be verified
Only true for specific values
The identity is incorrect