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Get the EulerEquations in Cylindrical coordinates

Hi, I am trying to using " VariationalMethods " packge to get the EulerEquations in Cylindrical coordinates system. But I can not get the right results (In Cartesian coordinates, it generates Laplacian equation. Obviously, the result in Cylindrical coordinates is wrong ). Please point out my mistake ! Thank you very much ! enter image description here

POSTED BY: bin li

I have found the mistake, it should be enter image description here

POSTED BY: bin li
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