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$\frac{1-2(\cos 60^{\circ}-\cos 80^{\circ})}{2 \sin 10^{\circ}} = \dots$

यदि $x = y \cos \frac{2\pi}{3} = z \cos \frac{4\pi}{3}$ है,तो $xy + yz + zx = $

यदि $\sec x + \tan x = 3, x \in (0, \frac{\pi}{2})$ है,तो $\sin x =$

यदि $y = \log_e \tan \left(\frac{\pi}{4} + \frac{x}{2}\right)$ है,तो $\tanh \left(\frac{y}{2}\right) = $

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