- #1

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## Homework Statement

I need to find [itex]\nabla[/itex]f(r). I am given r = |R| where R is a vector, R =(x,y,z). I also have the function f(r) which is a differentiable function of r.

## Homework Equations

So i know [itex]\nabla[/itex](g) = ([itex]\partial[/itex]g/[itex]\partial[/itex]x, [itex]\partial[/itex]g/[itex]\partial[/itex]y, [itex]\partial[/itex]g/[itex]\partial[/itex]z)

## The Attempt at a Solution

So I've got;

r=√(x^2 + y^2 + z^2)

[itex]\nabla[/itex](r) = (2x,2y,2z)

Do i need to apply [itex]\nabla[/itex] operator again to the above [itex]\nabla[/itex](r)?

Does [itex]\nabla[/itex]([itex]\nabla[/itex](r)) equal [itex]\nabla[/itex]f(r)?