The value of \( \lim _{x \rightarrow 0} \frac{\sqrt{1-\cos 2 x}}{x}...

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The value of \( \lim _{x \rightarrow 0} \frac{\sqrt{1-\cos 2 x}}{x} \) equals
\( \mathrm{P} \)
(1) 0
(2) 1
W
(3) \( \sqrt{2} \)
(4) does not exist
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