यदि $\cos x+\cos y+\cos \alpha=0$ और $\sin x+\sin y+\sin \alpha=0$ है,तो $\cot \left(\frac{x+y}{2}\right)$ का मान ज्ञात कीजिए।

  • A
    $\sin \alpha$
  • B
    $\cos \alpha$
  • C
    $\tan \alpha$
  • D
    $\cot \alpha$

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$\tan 6^{\circ} \tan 42^{\circ} \tan 66^{\circ} \tan 78^{\circ} = $

यदि $\sum_{r=1}^{50} \tan ^{-1} \frac{1}{2 r^2}=p$ है,तो $\tan p$ का मान ज्ञात कीजिए।

यदि $\operatorname{cosec} \theta = \frac{p+q}{p-q}$ है,तो $\cot \left(\frac{\pi}{4} + \frac{\theta}{2}\right)$ का मान ज्ञात कीजिए।

यदि $\cos \left(\frac{\pi}{4}-x\right) \cos 2 x+\sin x \sin 2 x \sec x = \cos x \sin 2 x \sec x+\cos \left(\frac{\pi}{4}+x\right) \cos 2 x$ है,तो $\sec x$ का एक संभावित मान है

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