$\int \cos ^{-1}\left(\sqrt{\frac{x}{a+x}}\right) d x=f(x)+C \Rightarrow f^{\prime}(a)=$

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{4}$

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