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$\tan 9^\circ - \tan 27^\circ - \tan 63^\circ + \tan 81^\circ = $

यदि $5(\tan^2 x - \cos^2 x) = 2\cos 2x + 9$ है,तो $\cos 4x$ का मान ज्ञात कीजिए।

यदि $\tan \beta = \cos \theta \tan \alpha$ है,तो ${\tan ^2}\frac{\theta }{2} = $

$4 \cos \frac{\pi}{7} \cos \frac{\pi}{5} \cos \frac{2 \pi}{7} \cos \frac{2 \pi}{5} \cos \frac{4 \pi}{7} = $

$\cot 18^{\circ} \cdot \cot 36^{\circ}+1=$

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