$\mathop {\lim }\limits_{x \to 2} \left( {{{\sqrt {1 - \cos \left\{ {2(x - 2)} \right\}} } \over {x - 2}}} \right)$

Question

Equals $\sqrt 2 $

Equals $-\sqrt 2 $

Equals ${1 \over {\sqrt 2 }}$

does not exist

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