मान लीजिए $0 < \alpha < 1$, $\beta = \frac{1}{3\alpha}$, और $\tan^{-1}(1 - \alpha) + \tan^{-1}(1 - \beta) = \frac{\pi}{4}$ है। तो $6(\alpha + \beta)$ का मान ज्ञात कीजिए:

  • A
    $6$
  • B
    $7$
  • C
    $8$
  • D
    $9$

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यदि $2\tan^{-1}(\cos x) = \tan^{-1}(2\csc x)$ है,तो $x =$

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