Find $\displaystyle \frac{dy}{dx}$ for each of the following functions
$$y = \ln\left(\frac{3 x - 10}{x\sqrt[4]{x^2+1}}\right)$$
$\displaystyle \frac{dy}{dx} =$

$$y = x^{\cos(x)}$$
$\displaystyle \frac{dy}{dx} =$