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$1 - 2{\sin ^2}\left( {\frac{\pi }{4} + \theta } \right) = $

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 = $

$\frac{3 + \cot 76^{\circ} \cot 16^{\circ}}{\cot 76^{\circ} + \cot 16^{\circ}}$ का मान ज्ञात कीजिए।

यदि $2 \sin \left(\theta+\frac{\pi}{3}\right)=\cos \left(\theta-\frac{\pi}{6}\right)$ है,तो $\tan \theta=$

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

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