Feynman Lectures Volume 3 Equation 9.41

vappole
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I don't understand how the last equation in the attached picture is derived from equations 9.40 and 9.39, can anyone help?
 

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Do the substitution as described and use the fact that ##\mu\epsilon## is small compared with ##A##.
The last equation is for the LHS only of eq.9.39 ... where ##C_I## is given in the first equation in 9.40.
 
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Oh, I got it. Tx
 
No worries - the RHS in the last equ. looks a lot like the RHS in equ.9.39 so I expect that's what threw you. I suspect that Feynman exploits the similarity on the next page.
 

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