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$(1+\cos \frac{\pi}{6})(1+\cos \frac{\pi}{3})(1+\cos \frac{2\pi}{3})(1+\cos \frac{7\pi}{6})$ का मान है

$\cos 36^{\circ} - \cos 72^{\circ}$ का मान ज्ञात कीजिए।

यदि $\tan \theta = 2$ और $\theta$ तीसरे चतुर्थांश में स्थित है,तो $\sec \theta$ का मान है

$\tan 1^{\circ} \times \tan 2^{\circ} \times \tan 3^{\circ} \times \cdots \times \tan 89^{\circ} = $

$\frac{1}{\cos 290^{\circ}}+\frac{1}{\sqrt{3} \sin 250^{\circ}} = $

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