Find all critical numbers:
x^(1/3)-x^(-2/3)?
I gave you the steps when you asked a similar question
http://www.jiskha.com/display.cgi?id=1288027486
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x^(1/3)-x^(-2/3)?
http://www.jiskha.com/display.cgi?id=1288027486
I did not hear back from you.