यदि $\tan \frac{\theta}{2} = \operatorname{cosec} \theta - \sin \theta$ है,तो $\tan^2 \frac{\theta}{2} =$

  • A
    $2 - \sqrt{5}$
  • B
    $-2 + \sqrt{5}$
  • C
    $2 + \sqrt{5}$
  • D
    $\sqrt{2} + 5$

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$96 \cos \frac{\pi}{33} \cos \frac{2 \pi}{33} \cos \frac{4 \pi}{33} \cos \frac{8 \pi}{33} \cos \frac{16 \pi}{33}$ का मान $......$ है।

सिद्ध कीजिए कि $\frac{\sin x - \sin 3x}{\sin^2 x - \cos^2 x} = 2 \sin x$.

$\cos ^3 \theta + \cos ^3(120^{\circ} + \theta) + \cos ^3(\theta - 120^{\circ}) = $

मान ज्ञात कीजिए: $\cos \frac{\pi}{5} \cos \frac{2\pi}{5} \cos \frac{4\pi}{5} \cos \frac{8\pi}{5}$

यदि $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ है,तो $\cos 3\theta$ का मान क्या है?

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