व्यंजक $\tan 9^{\circ}-\tan 27^{\circ}-\tan 63^{\circ}+\tan 81^{\circ}$ का मान ज्ञात कीजिए।

  • A
    $4$
  • B
    $3$
  • C
    $2$
  • D
    $1$

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यदि $3 \sin (\alpha-\beta)=5 \cos (\alpha+\beta)$ और $\alpha+\beta \neq \frac{\pi}{2}$ है,तो $\frac{\tan \left(\frac{\pi}{4}-\alpha\right)}{\tan \left(\frac{\pi}{4}-\beta\right)}=$

$\tan 81^{\circ}-\tan 63^{\circ}-\tan 27^{\circ}+\tan 9^{\circ}$ का मान ज्ञात कीजिए।

यदि $\pi < \alpha < \frac{3\pi}{2}$ है,तो $\sqrt{\frac{1 - \cos \alpha}{1 + \cos \alpha}} + \sqrt{\frac{1 + \cos \alpha}{1 - \cos \alpha}} = $

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