Editor
The derivative of $\frac{2}{x^{3}}$ is:
Difficulty: Easy
A: 
$-\frac{1}{x^{2}}$
B: 
$\frac{6}{x^{4}}$
C: 
$-\frac{6}{x^{4}}$
D: 
$-\frac{2}{3x^{2}}$
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