2 votes

Let the function $f(x)$ be defined as $f(x)=\mid x-1 \mid + \mid x-2 \:\mid$. Then which of the following statements is true?

- $f(x)$ is differentiable at $x=1$
- $f(x)$ is differentiable at $x=2$
- $f(x)$ is differentiable at $x=1$ but not at $x=2$
- none of the above