यदि $\cos^{-1} x + \cos^{-1} y = 2\pi$ है,तो $\sin^{-1} x + \sin^{-1} y$ का मान ज्ञात कीजिए।

  • A
    $\pi$
  • B
    $-\pi$
  • C
    $\frac{\pi}{2}$
  • D
    इनमें से कोई नहीं

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