Hi everyone,
I'm still at high school and the level of maths there is half of the level of maths of the Single Variable Calculus course I'm following now, so there are sometimes symbols I don't understand...
What does the symbol | mean in this question:
The Derivative of |x|
The slope of the graph of f(x)= |x| changes abruptly when x = 0. Does this function have a derivative? If so, what is it? If not, why not?
Thank you!
Wiskomen.

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