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> Can $f(x)=|x|^3$ be differentiated? If yes, how? If no, why? 
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What I've tried: 
lim as $h$ tends to $0$ of $$\frac{f(x+h)-f(x)}{h} = \lim\_{h \to 0} (3(x+h)^2|x=h|-3x^2|x|)/h$$

However, I have no idea how to proceed from here. Please help :(

Thanks!