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" 4.Prove that "(x+y)^(3)+(y+z)^(3)+(z+x...

" 4.Prove that "(x+y)^(3)+(y+z)^(3)+(z+x)^(3)-3(x+y)(y+z)(z+x)=2(x^(3)+y^(3)+z^(3)-3xyz)

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((x-y)^(3)+(y-z)^(3)+(z-x)^(3))/((x-y)(y-z)(z-x))=

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