What is \(\mathop {\lim }\limits_{{\rm{\theta }} \to 0} \frac{{\sqrt {1 - \cos {\rm{\theta }}} }}{{\rm{\theta }}}\) equal to?

1
 √2
2
2√2
3
\(\frac{1}{{\sqrt 2 }}\)
4
More than one of the above
5
None of the above

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