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## Main Question or Discussion Point

He said that the integral below equal to zero by an easy application of the divergence theorem.

[tex]\int_{\Omega }^{}f^{5}(f_{x}+2f_{y})=0[/tex]

where f is some function

Can somebody explain how?

[tex]\int_{\Omega }^{}f^{5}(f_{x}+2f_{y})=0[/tex]

where f is some function

Can somebody explain how?