1.

Let \[f(x)=\left\{ \begin{matrix}  0, & x

A. f is continuous but not differentiable
B. fis differentiable but not continuous
C. \[{f}'\] is continuous but not differentiable
D. \[{f}'\] is continuous and differentiable
Answer» D. \[{f}'\] is continuous and differentiable


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