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What is the derivative of $\tan(\sqrt x)$
Difficulty: Easy
A: 
$\sec^{2}(\sqrt x)$
B: 
$\frac{1}{\sqrt{2}} \sec^{2}(\sqrt x)$
C: 
$\frac{1}{2\sqrt{x}} \sec^{2}(\sqrt x)$
D: 
$ \sec^{2}(\sqrt x) \tan \left(\frac{1}{2\sqrt x} \right)$
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