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sum x^(2) y^(2) (x-y) = x^(2) y^(2) ( x-...

`sum x^(2) y^(2) (x-y) = x^(2) y^(2) ( x-y) + y^(2) z^92) (y-z) + z^(2) x^(2) (z-x)`

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The correct Answer is:
` (x-y) (y-z) ( z-x) (xy + yz + zx)`
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