यदि $\int \frac{\sin \theta}{\sin 3 \theta} d \theta = \frac{1}{2 k} \log \left|\frac{k+\tan \theta}{k-\tan \theta}\right|+c$ है,तो $k=$

  • A
    $\sqrt{3}$
  • B
    $\sqrt{2}$
  • C
    $\sqrt{7}$
  • D
    $\sqrt{5}$

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