a⁸-1= (a⁴-1)(a⁴+1)=(a²-1)(a²+1)(a⁴+1)= (a-1)(a+1)(a²+1)(a⁴+1)
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a⁸-1= (a⁴-1)(a⁴+1)=(a²-1)(a²+1)(a⁴+1)= (a-1)(a+1)(a²+1)(a⁴+1)