$\frac{d}{dx} \left( \cos^{-1} \sqrt{\frac{1 + \cos x}{2}} \right) = $

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $\frac{1}{3}$
  • D
    इनमें से कोई नहीं

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$\cos \left[ {{\cos }^{ - 1}}\left( {\frac{{ - 1}}{7}} \right) + {{\sin }^{ - 1}}\left( {\frac{{ - 1}}{7}} \right) \right] = $

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