\[f(x)=\left| \left| x \right|-1 \right|\] is not differentiable at [IIT Screening 2005]

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1.	\[f(x)=\left\| \left\| x \right\|-1 \right\|\] is not differentiable at [IIT Screening 2005]
A.	0
B.	\[\pm 1,\,0\]
C.	1
D.	\[\pm \,1\]
Answer» C. 1

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\[f(x)=\left| \left| x \right|-1 \right|\] is not differentiable at [IIT Screening 2005]

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