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Let f(x,y,z)=ln(x2+y2+z2)f ( x , y , z ) = \ln \left( x ^ { 2 } + y ^ { 2 } + z ^ { 2 } \right)

Question 178

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Let f(x,y,z)=ln(x2+y2+z2)f ( x , y , z ) = \ln \left( x ^ { 2 } + y ^ { 2 } + z ^ { 2 } \right) compute 2f\nabla ^ { 2 } f .

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