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Find the result of operating with d^2 /d x^2 + d^2 /d y^2 + d^2 /d...

Find the result of operating with d^2 /d x^2 + d^2 /d y^2 + d^2 /d z^2 on the function x^2 + y^2 + z^2 .

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Hence the final answer will be

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