यदि $\alpha > \beta > \gamma > 0$ है,तो व्यंजक $\cot ^{-1}\left\{\beta+\frac{(1+\beta^2)}{(\alpha-\beta)}\right\}+\cot ^{-1}\left\{\gamma+\frac{(1+\gamma^2)}{(\beta-\gamma)}\right\}+\cot ^{-1}\left\{\alpha+\frac{(1+\alpha^2)}{(\gamma-\alpha)}\right\}$ का मान क्या होगा?

  • A
    $\frac{\pi}{2}-(\alpha+\beta+\gamma)$
  • B
    $3 \pi$
  • C
    $0$
  • D
    $\pi$

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