यदि $\cot^{-1} \alpha + \cot^{-1} \beta = \cot^{-1} x$ है,तो $x = $

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

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