यदि $2 \tan^{-1}(\cos x) = \tan^{-1}(\csc^2 x)$ है,तो $x =$

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

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