(a-1/a)(a+1/a)(a²+1/a²)(a⁴+1/a⁴) =
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(a+1/a)(a-1/a)(a²+1/a²)(a⁴+1/a⁴)
=[(a+1/a)(a-1/a)](a²+1/a²)(a⁴+1/a⁴)
=[a²-(1/a)²](a²+1/a²)(a⁴+1/a⁴)
=[(a²-1/a²)(a²+1/a²)](a⁴+1/a⁴)
= [(a²)²-(1/a²)²](a⁴+1/a⁴)
= (a⁴-1/a⁴)(a⁴+1/a⁴)
= (a⁴)²-(1/a⁴)²
Therefore,
(a+1/a)(a-1/a)(a²+1/a²)(a⁴+1/a⁴) =
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