The derivative of $f(x)=\cos ^{-1}\left[\sin \sqrt{\frac{1+x}{2}}\right]+x^x$ with respect to $x$ at $x=1$ is equal to

  • A
    $1$
  • B
    $\frac{1}{4}$
  • C
    $\frac{3}{4}$
  • D
    $\frac{2}{3}$

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