Homework Answers
Solution:
Consider the LHS of the equation:
Let us expand the 2nd term 
. We know that:
Assume, 
. So 
becomes:
If we expand the partial derivative, we get:
Rearraigning the terms we get:
So LHS becomes:
Rearranging the terms we get:
From the continuity equation, we know:
Hence we get:
hence proved.
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