Calcolo del volume:
V= ∫ 1 e l n 2 (x) ⅆ x =3 [ x ⋅ l n 2 (x)-2x ⋅ ln(x)+2x ] 1 e =3{ [ e ⋅ l n 2 (e)-2e ⋅ ln(e)+2e ]-[ l n 2 (1)-2 ⋅ ln(1)+2 ] }=