Answer
$f’(x) = 4x^3 $
Work Step by Step
$f(x) = (x^2+1)(x^2-1) $
$ f’(x) = (2x)(x^2-1)+(x^2+1)(2x) $
$f’(x) = 2x^3-2x+2x^3+2x $
$f’(x) = 4x^3 $
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