Derivative function. Is the book wrong?

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noahsdev
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Differentiate the following with a positive index:
[itex]\frac{2}{\sqrt[3]{x}}[/itex]
What the book says:
[itex]\frac{-2}{3x^ \frac{2}{3}}[/itex]
But shouldn't it be:
[itex]\frac{-2}{3x^ \frac{4}{3}}[/itex]
I just wan't to know if I'm doing something wrong, thanks :).
 
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Cool thanks, just wanted to check.