यदि $\int \frac{2 \, dx}{\sqrt{\cot^2 x - \tan^2 x}} = -\sqrt{f(x)} + c$ है, तो $f(x) =$

  • A
    $\cot x$
  • B
    $\sin 2x$
  • C
    $\cos 2x$
  • D
    $\tan x$

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