Mathematics - Differentiation Question with Solution | TestHub

Let $f(x)=x^5+2{\mathrm{e}}^{x/4}$ for all $x\in \mathbf{R}$. Consider a function $g(x)$ such that $(g\circ f)(x)=x$ for all $x\in \mathbf{R}$. Then the value of $8g^{\prime }(2)$ is :