Integrate $\int\left(x+\frac{2}{x^2-1}\right)dx$

Find the integral

$\int\frac{1}{\left(x^4+1\right)}dx$

Find the integral

$\int\frac{dx}{x^2+7x+6}$

Find the integral

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

Find the integral

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

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

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