factorize taking x=a² y=b² z=c²
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(a^2+2)(b^4-c^4)+(b^2+2)(c^4-a^4)+(c^2+2)(a^4-b^4)
= a^2b^4+b^2c^4+c^2a^4-a^2c^4-b^2a^4-c^2b^4+2b^4-2b^4-2c^4+2c^4-2a^4+2a^4
=a^2b^4+b^2c^4+c^2a^4-a^2c^4-b^2a^4-c^2b^4 ans.
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