यदि $\sin ^{-1} x+\cos ^{-1} y=\frac{3 \pi}{10}$ है,तो $\cos ^{-1} x+\sin ^{-1} y$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi}{10}$
  • B
    $\frac{7\pi}{10}$
  • C
    $\frac{9\pi}{10}$
  • D
    $\frac{3\pi}{10}$

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