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![\( f(x) \) is differentiable for all x-values.
\[
x=-3,=-1, x=0
\]
\[
x=0
\]
\[
x=-3, x=-1
\]](https://media.cheggcdn.com/study/122/12254ca3-5c54-41b7-b9ca-081403edf807/image)
Expert Answer
A function is not differentiable at if its graph has a vertical tangent line at .