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Factorise : x(1+y^(2))(1+z^(2))+y(1+z^(2...

Factorise : `x(1+y^(2))(1+z^(2))+y(1+z^(2))(1+x^(2))+z(1+x^(2))(1+y^(2))+4xyz`

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The correct Answer is:
`(x+y+z+xyz)(xy+yz+zx+1)`
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