1.

Which of the following function 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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