It is well known that the derivative of a 'function of function' $\displaystyle y\{u(x)\}$ is...

$\displaystyle \frac {dy}{dx} = \frac{dy}{du} \cdot \frac{du}{dx}$

A question for you: does it exist a similar expression for the second derivative $\displaystyle \frac {d^{2} y}{dx^{2}}$?...

Any help will be greatly appreciated!...

Kind regards

$\displaystyle \chi$ $\displaystyle \sigma$