જો $\cos^{-1} x + \cos^{-1} y = 2\pi$ હોય,તો $\sin^{-1} x + \sin^{-1} y$ ની કિંમત શોધો.

  • A
    $\pi$
  • B
    $-\pi$
  • C
    $\frac{\pi}{2}$
  • D
    આમાંથી કોઈ નહીં

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