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$\begin{align*}\lim_{x\to o}\frac{(1 - \cos2x)^2}{2x \; \tan x -x \tan 2x } \end{align*} $ is :

$\begin{array}{1 1}(1)\; 2 \\ (2)\; \frac{-1}{2} \\ (3)\; \frac{1}{2} \\ (4)\; -2 \end{array} $

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