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CMBR
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Homework Statement
See attachment.
Homework Equations
The Attempt at a Solution
I'm not understanding how the laplacian is creating those 3 terms in 5.4.5.
I just understand the basics that laplacian on f(x,y) = d2f/dx2 + d2f/dy2. Can someone elaborate?
Thanks in advance.
EDIT:
Just realized this is an identity of vector calculus (second derivative of 2 scalars)...
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