Find the higher order ($3$) derivative of $\frac{1}{\sqrt{x}}$

Find the derivative

$\frac{d^3}{dx^3}\left(x\cdot \cos\left(x\right)\right)$

Find the derivative

$\frac{d^2}{dx^2}\left(x\cdot \cos\left(x\right)\right)$

Find the derivative

$\frac{d^2}{dx^2}\left(x\cdot\cos\left(x\right)\right)$

Find the derivative

$\frac{d^2}{dx^2}\left(\cos\left(x\right)+\sin\left(x\right)+\ln\left(\cos\left(x\right)\right)\cdot\cos\left(x\right)+x\cdot\sin\left(x\right)\right)$

Find the derivative

$\frac{d^2}{dx^2}\left(\tan\left(x\right)-arctan\left(x\right)\right)$

Find the derivative

$\frac{d^4}{dx^4}\left(x\cdot\ln\left(x\right)\right)$

Find the derivative

$\frac{d^2}{dx^2}\left(g de4^4+\sin\left(6x\right)\right)$