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$\frac{\cos 10^o + \sin 10^o}{\cos 10^o - \sin 10^o} = $

यदि $\cos (A - B) = \frac{3}{5}$ और $\tan A \tan B = 2$ है,तो

यदि $\sin (A+B) \sin (A-B)+\cos (A+B) \cos (A-B)=\frac{1}{2}$ और $0 < B < \frac{\pi}{2}$ है,तो $B=$

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