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## Homework Statement

Verify that the function u=1/(x^2 + y^2 + z^2)^2 is a solution of the 3-dimensional Laplace equation uxx+uyy+uzz=0

## The Attempt at a Solution

I know how to solve the partial derivatives, so I know that uxx=uyy=uzz for this problem. How can their sum equal 0?