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## Homework Statement

By computing ∇(1/r) show that

∫∇²(1/r).dV = -4Pi if the volume 'V' is a sphere containing the origin.

## The Attempt at a Solution

∫∇²(1/r).dV = ∫∇(1/r).dS But I cant differentiate (1/r) since the sphere contains the origin. Im wondering if there's any other way to tackle this.

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