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$\frac{3 + \cot 76^{\circ} \cot 16^{\circ}}{\cot 76^{\circ} + \cot 16^{\circ}}$ का मान ज्ञात कीजिए।

$\cos(36^{\circ}-A) \cos(36^{\circ}+A) + \cos(54^{\circ}+A) \cos(54^{\circ}-A) = $

$\cos A + \cos (240^\circ + A) + \cos (240^\circ - A) = $

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 $\tan 2 \alpha$ का मान ज्ञात कीजिए।

यदि $\frac{\sin(x+y)}{\sin(x-y)} = \frac{a+b}{a-b}$ है,तो $\frac{\tan x}{\tan y} = $

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