यदि $\sec^{-1} x = \csc^{-1} y$ है,तो $\cos^{-1} \frac{1}{x} + \cos^{-1} \frac{1}{y} = $

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

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