Integrate the function $\frac{x^2}{1+x^4}$ from 0 to $\infty $

Find the integral

$\int\left(x^2sen\left(2x\right)\right)dx$

Find the integral

$\int x^2cos\left(2x\right)dx$

Find the integral

$\int x^2\sin2xdx$

Find the integral

$\int x^2\cdot\cos\left(x\right)dx$

Find the integral

$\int\:x^2\:sen\:3x\:dx$

Find the integral

$\int x^3sin\left(2x\right)dx$

Find the integral

$\int x^2\cos3xdx$