$\sin^{-1}x + \sin^{-1}\frac{1}{x} + \cos^{-1}x + \cos^{-1}\frac{1}{x} = $

  • A
    $\pi$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{3\pi}{2}$
  • D
    इनमें से कोई नहीं

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