Find the integral $\int\left(9+x^2\right)^{-2}dx$

Find the integral

$\int\left(\frac{arctan\left(2x\right)}{x}\right)dx$

Find the integral

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

Find the integral

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

Find the integral

$\int xsinx\:dx$

Find the integral

$\int\left(\frac{\cos\left(x\right)}{x}\right)dx$

Find the integral

$\int\left(x^3+2\right)^23x^2dx$

Find the integral

$\int\frac{cos\left(x\right)}{x}dx$