(a+1)(a-1)(a²+1)

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(a+1)(a-1)(a²+1)(a+1)(a-1)(a²+1)(a+1)(a-1)(a²+1)=(a^2-1)(a^2+1)=a^4-1

(a+1)(a-1)(a²+1)
(a+1)(a-1)(a²+1)

(a+1)(a-1)(a²+1)
=(a^2-1)(a^2+1)
=a^4-1