I found this document at
Please see it. My equation is similar to that, but my equation only has additional terms
I need to apply the same procedure mentioned on that site on these additional terms.
Could you help me with how I can do the same task these terms?
This equation used in the elasticity problem and considering it as 3D lead to accurate results. This is the reason for using 3D.
Thanks for sharing the paper. The content of the paper was difficult for me because my field is not exactly mathematics, I am an engineering student.