यदि $\frac{1}{2} \sin^{-1}\left(\frac{3 \sin 2\theta}{5+4 \cos 2\theta}\right) = \tan^{-1} x$ है,तो $x =$

  • A
    $\tan \frac{\theta}{3}$
  • B
    $\frac{1}{3} \tan \theta$
  • C
    $\tan 3\theta$
  • D
    $\frac{1}{3} \tan 3\theta$

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$\tan \left[ \cos^{-1} \frac{4}{5} + \tan^{-1} \frac{2}{3} \right] =$

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