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## Homework Statement

three functions:

[tex]y=\begin{cases}\arctan \frac{1}{x}\ x\neq0\\ 0\ x=0\end{cases}[/tex]

[tex]y=\frac{1}{x}, y=|x^2-1|[/tex] and what about inflection point?

## The Attempt at a Solution

first function is concave on left of 0, convex on right, so from definition it should be inflection point, but its not continuous in this point, a function need to be continuous in this place or not?

in 2, [tex]x=0[/tex] should be inflection point, but its not in the domain, so is there inflection point?

in 3, function is continuous in [tex]x=1[/tex] but not differentiable, is there inflection point or not?