The range of sec-1 x is

1
\([0, \pi] - \left\{ \frac \pi 2 \right\}\)
2
\(\left[ \frac {-\pi} 2, \frac \pi 2 \right]\)
3
\(\left( \frac {-\pi} 2, \frac \pi 2 \right)\)
4
[0, π]

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