\textbf{116-} The function $f(x) = \begin{cases} |x| + [-x] & |x^2| < x^2 \\ 1 + \cos\pi x & |x^2| = x^2 \\ [x^2] - [x] & |x^2| > x^2 \end{cases}$ has how many points of discontinuity?
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(1) $2$ \hfill (2) $3$
(3) Uncountable \hfill (4) Continuous everywhere.
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