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यदि $A=35^{\circ}, B=15^{\circ}$ और $C=40^{\circ}$ है,तो $\tan A \cdot \tan B+\tan B \cdot \tan C+\tan C \cdot \tan A$ का मान ज्ञात कीजिए।

$1+\cos 10^{\circ}+\cos 20^{\circ}+\cos 30^{\circ}=$

यदि $\cos (A-B)=3/5$ और $\tan A \tan B=2$ है,तो निम्नलिखित में से कौन सा सत्य है?

$\cos(18^{\circ}-A) \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cos(72^{\circ}+A)$ का मान किसके बराबर है?

यदि $(1 + \tan \theta )(1 + \tan \phi ) = 2$ है,तो $\theta + \phi = \dots ^\circ$

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