(2n+1)(4n²-1)(2n-1)

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(2n+1)(4n²-1)(2n-1)

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

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