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Homework Statement
Find $$\frac{\text{d}}{\text{d}x}|x|$$
Homework Equations
The Attempt at a Solution
I know that ##\frac{\text{d}}{\text{d}x}x=1## but it's ##|x|##. For ##x>0##, derivative is 1 and for ##x<0##, derivative is -1.
And what's the derivative at ##x=0##? ##0##?