Mathematics - Application of Derivative Question with Solution | TestHub

Let $\mathrm{f}:\mathrm{R}\to \mathrm{R}$ be a function defined by $f(x)=\Vert x+2|-2|x\Vert$. If $m$ is the number of points of local minima and $n$ is the number of points of local maxima of $f$, then $m+n$ is