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[tex] {x}^{6} - {x}^{4} - {x}^{2} + 1 [/tex]
[tex] {x}^{6} - {x}^{4} - {x}^{2} + 1 [/tex]
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... = x⁴ * (x² - 1) - (x² - 1) = (x² - 1)*(x⁴ - 1) = (x-1)(x+1)(x² - 1)(x² + 1) == (x - 1)² * (x + 1)² * (x² + 1)