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kings13

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**Derivative and horizontal tangent help!**

## Homework Statement

Determine the point at which the graph of the function has a horizontal tangent line.

## Homework Equations

http://www.webassign.net/cgi-bin/symimage.cgi?expr=f(x) = (8 x**2)/(x**2+8)and f(x)=x/ root2x-1endroot## The Attempt at a Solution

128x/(x^2+8)^2? no idea what I am looking for really

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