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$\cos \frac{\pi}{7} \cos \frac{2\pi}{7} \cos \frac{3\pi}{7} =$

$\frac{\sin 3\theta - \cos 3\theta}{\sin \theta + \cos \theta} + 1 = $

यदि $\alpha = \sin 36^{\circ}$ है,तो $\alpha$ निम्नलिखित में से किस समीकरण का मूल है?

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

सिद्ध कीजिए कि: $\cos 6x = 32 \cos^6 x - 48 \cos^4 x + 18 \cos^2 x - 1$

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