If $f(x)$ is defined as follows: $f(x)=\left{\begin{matrix}4,-\infty If \(k$ is the number of points where $f(x)$ is not differentiable, then $k-2=$

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If \(f(x)\) is defined as follows: \(f(x)=\left{\begin{matrix}4,-\infty If \(k\) is the number of points where \(f(x)\) …