Which of the following functions is not differentiable at\[x=1\]?

1.	Which of the following functions is not differentiable at\[x=1\]?
A.	\[f(x)=({{x}^{2}}-1)\left\| (x-1)(x-2) \right\|\]
B.	\[f(x)=\sin (\left\| x-1 \right\|)-\left\| x-1 \right\|\]
C.	\[f(x)=\tan (\left\| x-1 \right\|)+\left\| x-1 \right\|\]
D.	None of these
Answer» D. None of these

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Which of the following functions is not differentiable at\[x=1\]?

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