(×-1) (×+1) (×2+1) (×4+1)
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(x+1)(x-1)(x²+1)(x⁴+1)
By using a²-b²=(a+b)(a-b)
(x²-1)(x²+1)(x⁴+1)
= (x⁴-1)(x⁴+1)
= x⁸-1
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