यदि $y = \tan^{-1} \left( \frac{1 - \cos 3x}{\sin 3x} \right)$ है,तो $\frac{dy}{dx} = \ldots$

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

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