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$\cos ^{2} 45^{\circ}-\sin ^{2} 15^{\circ}$ का मान क्या है?

$\cos \frac{\pi}{12} = ?$

$\cos \alpha \sin (\beta - \gamma ) + \cos \beta \sin (\gamma - \alpha ) + \cos \gamma \sin (\alpha - \beta ) = $

मान लीजिए $\cos (\alpha+\beta)=\frac{4}{5}$ और $\sin (\alpha-\beta)=\frac{5}{13}$,जहाँ $0 \leq \alpha, \beta \leq \frac{\pi}{4}$,तो $\tan 2 \alpha=$

यदि $\tan(A + B) = p$ और $\tan(A - B) = q$ है,तो $p$ और $q$ के पदों में $\tan(2A)$ का मान क्या होगा?

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