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यदि $\cos \frac{\pi}{7} \cos \frac{2 \pi}{7} \cos \frac{4 \pi}{7} = \frac{\sin \frac{8 \pi}{7}}{8 \sin \frac{\pi}{7}}$ है,तो $\sin \frac{\pi}{14} \sin \frac{3 \pi}{14} \sin \frac{5 \pi}{14} \sin \frac{7 \pi}{14} \sin \frac{9 \pi}{14} \sin \frac{11 \pi}{14} \sin \frac{13 \pi}{14} = $

यदि $\frac{\cos x}{\cos (x-2 y)}=\lambda$ है,तो $\tan (x-y) \tan y$ का मान क्या होगा?

यदि $\cos \theta + \cos 7\theta + \cos 3\theta + \cos 5\theta = 0$ है,तो $\theta$ का मान ज्ञात कीजिए:

$\sin ^2 5^{\circ}+\sin ^2 10^{\circ}+\sin ^2 15^{\circ}+\ldots+\sin ^2 90^{\circ}$ का मान ज्ञात कीजिए।

$\frac{1}{\sin 10^\circ} - \frac{\sqrt{3}}{\cos 10^\circ} =$

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