(2n+1)(4n2二次方-1)(2n-1)

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(2n+1)(4n2二次方-1)(2n-1)(2n+1)(4n2二次方-1)(2n-1)(2n+1)(4n2二次方-1)(2n-1)(2n+1)(4n^2-1)(2n-1)=(4n^2-1)(4n^2

(2n+1)(4n2二次方-1)(2n-1)
(2n+1)(4n2二次方-1)(2n-1)

(2n+1)(4n2二次方-1)(2n-1)
(2n+1)(4n^2-1)(2n-1)
=(4n^2-1)(4n^2-1)
=16n^4-8n^2+1

要干什么呀!!!