Question

integrate x2 / (x2+1)
(3x2+4) dx.

Answer 1

$\int\limits^a_b {(3x^2+4)} \, dx = 3\int\limits^a_b {x^2} \, dx +4 \int\limits^a_b {1} \, dx =3*x^3/3+4x=x^3+4x$