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Find the derivative of the function:

$$f\left( x \right) =\sqrt { \arctan { x } } $$

Select ALL that apply.

$\cfrac{1}{2 \sqrt{\arctan(x)}}$

$\cfrac{1}{2} \sqrt{\arctan(x)}$

$\cfrac{1}{2(1+x^2)\sqrt{arctan(x)}}$

$\cfrac{1}{2(1+x^2)(arctan(x))^{1/2}}$