Find the derivative using the quotient rule $\left(3a^2b+5\right)^2$

Find the integral

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

$factor\left(x^4+x^3-6x^2-4x+8\right)$

Find the integral

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

Find the integral

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

Find the integral

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

Find the integral

$\int\cos\left(x\right)\div xdx$

Find the integral

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