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If $y=\frac{2}{\sqrt[3]{x}}$, then dy/dx equals:
Difficulty: Easy
A: 

$-6(\sqrt[3]{x^{4}})$

B: 

$-\frac{2}{3\sqrt[3]{x^{4}}}$

C: 

$-6(\sqrt[2]{x^{4}})$

D: 

$-\frac{1}{\sqrt[3]{x^{4}}}$

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