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The classical theory of electric and magnetic fields, both in the static and dynamic case. It also covers general questions about magnets, electric attraction/repulsion, etc. Distinct from electrical-engineering.

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How to derive some part of the Proca lagrangian for a Vector (spin-1)? [closed]

I'm trying to derive Eq. (10.17) & Eq. (10.18) from the textbook. Where does the term -1/(4*pi) come from, and how do I cancel out the rest of the term (see my text, second picture).
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