Spiegare i passaggi.
(x - 1)^2·(x + 1) = (x + 1)·(x^2 - 2·x + 1)
=x^3 - x^2 - x + 1
∫(x^3 - x^2 - x + 1)dx=x^4/4 - x^3/3 - x^2/2 + x + C
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