\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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What is the domain of the function \(f(x) = \ln(x^2 + 1)\)?
\((-\infty, \infty)\)
\((-\infty, 0) \cup (0, \infty)\)
\((-1, 1)\)
\([ -1, 1 ]\)
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