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Could someone help me with this simple differentiation?

u= 5root(1/x^8)

--> =(1/x^8)^1/5

= (1/5)/(x^8/5)

du/dx= ?

I don't know what to do after here, as I keep getting the wrong answer.

The answer is du/dx = (-8/5)x^-13/5

:( Thanks!!

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