Not (xy)2 (x-y)^2

Algebra Level 4

Consider the polynomial x4+y4+z42x2y22y2z22z2x2. x^4 + y^4 + z^4 - 2x^2y^2 - 2y^2z^2 - 2 z^2 x^2.

Can it be factored over the integers (polynomials have integer coefficients)?

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