\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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The graph of \(f\) is shown below.
Solve \(f(x) \leq 3\).
\(S = [-2 , 2]\)
\(S = (-\infty , -2] \cup [2 , +\infty)\)
\(S = \{-2 , 2\}\)
\(S = [-1 , 1]\)
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