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Homework Statement
Where is the function f(x) = |x| differentiable?
Homework Equations
[f(x+h) - f(x)] / h
The Attempt at a Solution
I know that the graph of f(x)=|x| shows a corner at the origin from which 2 lines project at opposite slopes, as in they are symmetric about the y-axis.
I've seen the solution but I don't understand why f(x) is differentiable for every number except 0.