$f (x) = [\frac{x^{2} + 1}{x^{2} + [| x |] + 1}]$ is discontinuous at k points, then k is -
(where [.] denotes greatest integer function)

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Solution

$f (x) = {\begin{matrix} 1, & | x | < 1 0 & | x | \geq 1 \end{matrix}}$

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