फलन $f(x) = \sqrt{2 - \sec^{-1}x}$ का प्रांत (domain) ज्ञात कीजिए।

  • A
    $\left( -\infty, -1 \right] \cup \left[ 1, \infty \right)$
  • B
    $\left( -\infty, -1 \right] \cup \left[ \sec 1, \infty \right)$
  • C
    $\left( -\infty, \sec 2 \right] \cup \left[ 1, \infty \right)$
  • D
    $\left( -\infty, \sec 2 \right] \cup \left[ \sec 1, \infty \right)$

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