यदि $\sin^{-1}(x - 2) + \cos^{-1}(x) + \tan^{-1}(x + 2) + \cot^{-1}(x + 4) = \sec^{-1}(\sqrt{k}) - \frac{\pi}{2}$ है, तो $\cos(2 \csc^{-1}\sqrt{k - 1}) = \dots$

  • A
    $\frac{15}{16}$
  • B
    $\frac{31}{32}$
  • C
    $\frac{63}{64}$
  • D
    $\frac{7}{8}$

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