(x^4-4)(x^4+4)=(x^2-2)(x^2+2)((x^2+2)^2-4x^2)=(x^2-2)(x^2+2)(x^2+2+2x)(x^2+2-2x)
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(x^4-4)(x^4+4)=(x^2-2)(x^2+2)((x^2+2)^2-4x^2)=(x^2-2)(x^2+2)(x^2+2+2x)(x^2+2-2x)