Find the integral $\frac{d}{dx}\left(\int\frac{1}{\sqrt{t^{\left(2+1\right)}}}\right)$

Find the integral

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

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

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

Find the integral

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

Find the integral

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