Which one of the following functions is differentiable for all real va

1.	Which one of the following functions is differentiable for all real values of x?
A.	\[\frac{x}{\left\| x \right\|}\]
B.	\[x\left\| x \right\|\]
C.	\[\frac{1}{\left\| x \right\|}\]
D.	\[\frac{1}{x}\]
Answer» C. \[\frac{1}{\left\| x \right\|}\]

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Which one of the following functions is differentiable for all real values of x?

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