How do I calculate derivative of sgn(x) – math.stackexchange.com

How do I calculate derivative of sgn(x) – math.stackexchange.com

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We know $|x| = \sqrt(x^2)$, determine the second derivative $\frac{d^2}{dx^2}|x|$, So the first derivative is sgn(x), but how do I get the second?

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