मान ज्ञात कीजिए: $\cos^{-1}(\cos \frac{4\pi}{3}) + \sin^{-1}(\sin \frac{4\pi}{3}) = \dots$

  • A
    $\frac{4\pi}{3}$
  • B
    $\frac{8\pi}{3}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{3\pi}{2}$

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