Factor by completing the square $\frac{1}{\left(x+1\right)^2\left(x^2+1\right)}$

Find the integral

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

Find the integral

$\int\left(3x^2+1\right)^6dx$

Find the integral

$\int12x^5dx$

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

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