\(\mathop {\lim }\limits_{{\rm{x}} \to 0} \frac{{\sqrt {\left( {\frac{1}{2}\left( {1 - {\rm{cos}}2{\rm{x}}} \right)} \right)} }}{{\rm{x}}}\) is equal to

1
1
2
-1
3
0
4
none of these

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