\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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The function \(y = \sec(x)\) is undefined for which of the following values?
\(x = 0\)
\(x = \pi\)
\(x = \frac{\pi}{2}\)
\(x = \frac{\pi}{4}\)
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