$\cos ^{-1}\left(-\frac{1}{2}\right)$ का मुख्य मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{2}$
  • B
    $\frac{\pi}{6}$
  • C
    $\frac{2 \pi}{3}$
  • D
    $\frac{5 \pi}{6}$

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