(a+1)(a-1)(a²+1) (2y-1)(4y²+1)(2y+1)

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(a+1)(a-1)(a²+1)(2y-1)(4y²+1)(2y+1)(a+1)(a-1)(a²+1)(2y-1)(4y²+1)(2y+1)(a+1)(a-1)

(a+1)(a-1)(a²+1) (2y-1)(4y²+1)(2y+1)
(a+1)(a-1)(a²+1) (2y-1)(4y²+1)(2y+1)

(a+1)(a-1)(a²+1) (2y-1)(4y²+1)(2y+1)
(a+1)(a-1)(a²+1)
=(a²-1)(a²+1)
=a的4次方-1

(2y-1)(4y²+1)(2y+1)
=(2y-1)(2y+1)(4y²+1)
=(4y²-1)(4y²+1)
=16y的4次方-1