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## Homework Equations

Hey guys I had a slight problem trying to find divergence of vector fields for the following equation:

F(x,y,z)=(yzi-xzj-xyk)/(x^2 + y^2 + z^2)

So I want to know if its possible of substitute (x^2 + y^2 + z^2) for 1 since that is the equation of a sphere? If not could some one please help me solve this question...Thanks :)