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## Homework Statement

http://img245.imageshack.us/img245/2353/87006064.th.jpg [Broken]

I need to find the unit vector in the direction of [tex] \vec{F} [/tex] at the point (1, 2, -2).

## Homework Equations

## The Attempt at a Solution

well first of all I need to find what F is right, which is gradf.. how can I get that?? what is the level surface of f? is it a sphere?

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