Answer :

Applying the formula (a + b)(a - b) = a2 - b2 on first two terms


(n – 1)(n + 1)(n2 + 1) = (n2 - 1) (n2 + 1)


Applying the formula (a + b)(a - b) = a2 - b2 again


(n – 1)(n + 1)(n2 + 1) = (n4 - 1)


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