यदि $\int(\sqrt{\operatorname{cosec} x+1}) d x=k \tan ^{-1}(f(x))+c$ है, तो $\frac{1}{k} f\left(\frac{\pi}{6}\right)=$

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

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