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यदि $\sin A = \frac{1}{\sqrt{10}}$ और $\sin B = \frac{1}{\sqrt{5}}$,जहाँ $A$ और $B$ धनात्मक न्यून कोण हैं,तो $A + B = $

सिद्ध कीजिए कि $\cos \left( \frac{\pi}{4} + x \right) + \cos \left( \frac{\pi}{4} - x \right) = \sqrt{2} \cos x$.

$\sin 47^\circ + \sin 61^\circ - \sin 11^\circ - \sin 25^\circ$ का मान ज्ञात कीजिए।

यदि $\tan \left( \frac{\pi }{4} + \theta \right) + \tan \left( \frac{\pi }{4} - \theta \right) = \lambda \sec 2\theta$ है,तो $\lambda$ =

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