$\cos^{-1}[\cos(-680^{\circ})]$ का मुख्य मान . . . . . . के बराबर है।

  • A
    $\frac{34\pi}{9}$
  • B
    $\frac{-2\pi}{9}$
  • C
    $\frac{2\pi}{9}$
  • D
    $\frac{\pi}{9}$

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