If \[f(x)=\left\{ \begin{matrix} {{x}^{3}},\,\,{{x}^{2}}1 \\ \end{matrix} \right.\], then \[f(x)\] is differentiable at

\[(-\infty ,\infty )\tilde{\ }\{1,-1,0\}\]

\[(-\infty ,\infty )\tilde{\ }\{1,-1\}\]

\[(-\infty ,\infty )\tilde{\ }\{-1\}\]

If \[f(x)=\left\{ \begin{matrix} {{x}^{3}},\,\,{{x}^{2}}1 \\ \e

1.	If \[f(x)=\left\{ \begin{matrix} {{x}^{3}},\,\,{{x}^{2}}1 \\ \end{matrix} \right.\], then \[f(x)\] is differentiable at
A.	\[(-\infty ,\infty )-\{1\}\]
B.	\[(-\infty ,\infty )\tilde{\ }\{1,-1\}\]
C.	\[(-\infty ,\infty )\tilde{\ }\{1,-1,0\}\]
D.	\[(-\infty ,\infty )\tilde{\ }\{-1\}\]
Answer» C. \[(-\infty ,\infty )\tilde{\ }\{1,-1,0\}\]

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If \[f(x)=\left\{ \begin{matrix} {{x}^{3}},\,\,{{x}^{2}}1 \\ \end{matrix} \right.\], then \[f(x)\] is differentiable at

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