Editor
The derivative of $(x+4)^{\frac{1}{3}}$ is:
Difficulty: Easy
A: 
$\frac{1}{3}(x+4)^{-\frac{3}{2}}$
B: 
$\frac{1}{7(x+4)^{\frac{1}{5}}}$
C: 
$\frac{1}{3(x+4)^{\frac{2}{3}}}$
D: 
$\frac{1}{3}(x+4)^{-2}$
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