यदि $\tan \beta = \frac{n \sin \alpha \cos \alpha}{1 - n \cos^2 \alpha}$ है,तो $\tan (\alpha + \beta) \cdot \cot \alpha =$

  • A
    $\frac{-1}{n-1}$
  • B
    $n+1$
  • C
    $1-n$
  • D
    $\frac{1}{n+1}$

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