Spiegare i passaggi.
(3·x^2 - 1)/(x^2 + 1)= 3 - 4/(x^2 + 1)
quindi:
∫(3 - 4/(x^2 + 1))dx =∫(- 4/(x^2 + 1)dx + ∫(3)dx=
=- 4·∫(1/(x^2 + 1))dx + ∫(3)dx=
=- 4·ATAN(x) + 3·x + c
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