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$\frac{\tan 80^{\circ}-\tan 10^{\circ}}{\tan 70^{\circ}}$ का मान ज्ञात कीजिए।

यदि $A+B=\frac{\pi}{4}$,तो $\frac{\cos B-\sin B}{\cos B+\sin B}=$

यदि $0 < A < B < \frac{\pi}{4}$,$\cos (A+B) = \frac{11}{61}$ और $\sin (A-B) = \frac{24}{25}$ है,तो $\sin 2A + \sin 2B = $

$\sin \left(\frac{5 \pi}{24}\right) \cdot \cos \left(\frac{\pi}{24}\right)$ का मान है

$\cos 15^\circ - \sin 15^\circ$ का मान किसके बराबर है?

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