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