Question: If u= 1/r , where r^2= (x-a)^2 + (y-6)^2 + (x-c)^2 . r ) Prove that partial^2 u/partialX^2 + partial^2 u/partial Y^2+ partial^2 u/partial

If u= 1/r , where r^2= (x-a)^2 + (y-6)^2 + (x-c)^2 .

If u= 1/r , where r^2= (x-a)^2 + (y-6)^2 + (x-c)^2 . r ) Prove that partial^2 u/partialX^2 + partial^2 u/partial Y^2+ partial^2 u/partial Z^2=0.

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