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$1 + \cos 2x + \cos 4x + \cos 6x = $

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

यदि $\tan A = \frac{5}{6}$ और $\tan B = \frac{1}{11}$ है,तो $A + B = $

यदि $b \sin \alpha = a \sin (\alpha + 2\beta)$ है,तो $\frac{a + b}{a - b} = $

$\frac{\tan 52^{\circ} - \tan 38^{\circ}}{\tan 14^{\circ}} = $

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