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

यदि दो न्यून कोण $A$ और $B$ इस प्रकार हैं कि $A \neq B$ और $\frac{x}{y}=\frac{\cos A}{\cos B}$,तो $\frac{x \tan A-y \tan B}{x+y}=$

मान ज्ञात कीजिए: $\sin (\beta + \gamma - \alpha ) + \sin (\gamma + \alpha - \beta ) + \sin (\alpha + \beta - \gamma ) - \sin (\alpha + \beta + \gamma )$

$\tan 20^\circ + \tan 40^\circ + \sqrt{3} \tan 20^\circ \tan 40^\circ = $

$\cos ^2\left(\frac{\pi}{6}+\theta\right)-\sin ^2\left(\frac{\pi}{6}-\theta\right)$ का मान ज्ञात कीजिए।

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