જો $\sin^{-1} x + \sin^{-1} y = \frac{2\pi}{3}$ હોય,તો $\cos^{-1} x + \cos^{-1} y = $

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

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