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here,
x^3 + y^3 + z^3 -3xyz= (x+y+z) (x^2+y^2+z^2-xy-yz-zx)
if (x+y+z)=o
therefor
x^3+y^3+z^3-3xyz=0
x^3+y^3+z^3=3xyz
x^3 + y^3 + z^3 -3xyz= (x+y+z) (x^2+y^2+z^2-xy-yz-zx)
if (x+y+z)=o
therefor
x^3+y^3+z^3-3xyz=0
x^3+y^3+z^3=3xyz
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