Question

Calcule a integral ∫3x2senx3dx

Answer 1

$\int 3x^{2}sen(x^{3})dx =3\int x^{2}sen(x^{3}) \\ u=x^{3} \\ 3\int \frac{sen(u)}{3}du = 3*\frac{1}{3}\int sen(u)du=1*(-cos(u))=-cos(x^{3})+C$