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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सिद्ध कीजिए कि $\cos ^{-1} \frac{4}{5} + \cos ^{-1} \frac{12}{13} = \cos ^{-1} \frac{33}{65}$

मान ज्ञात कीजिए: $\operatorname{cosec}^{-1}\left[\left(\frac{\tan ^2\left(\frac{\alpha-\pi}{4}\right)-1}{\tan ^2\left(\frac{\alpha-\pi}{4}\right)+1}+\cos \frac{\alpha}{2} \cdot \cot 5 \alpha\right) \sec \frac{11 \alpha}{2}\right]$

यदि $\tan ^{-1}\left(\frac{1-x}{1+x}\right)-\frac{1}{2} \tan ^{-1} x=0$,$x>0$ के लिए,तो $x=$

$\frac{d}{dx} \left[ \tan^{-1} \left( \frac{a - x}{1 + ax} \right) \right] = $

यदि $\sin^{-1} x = \theta + \beta$ और $\sin^{-1} y = \theta - \beta$ है,तो $1 + xy = $

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