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$\frac{\sin 70^\circ + \cos 40^\circ}{\cos 70^\circ + \sin 40^\circ} = $

$\tan 1^\circ \tan 2^\circ \tan 3^\circ \dots \tan 89^\circ$ का मान किसके बराबर है?

यदि $\theta$ प्रथम चतुर्थांश में स्थित है और $5 \tan \theta = 4$ है,तो $\frac{5 \sin \theta - 3 \cos \theta}{\sin \theta + 2 \cos \theta}$ का मान ज्ञात कीजिए।

$\sin^{2} 51^{\circ} + \sin^{2} 39^{\circ}$ का मान है

$\sin ^2 \frac{2 \pi}{3}+\cos ^2 \frac{5 \pi}{6}-\tan ^2 \frac{3 \pi}{4}=$

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