Could someone explain how can one go from(adsbygoogle = window.adsbygoogle || []).push({});

$$ \int dx\ \frac{-1}{4}F^{\mu \nu}F_{\mu \nu}$$

where $$F_{\mu \nu} = \partial_{\mu} \phi_{\nu}-\partial_{\nu} \phi_{\mu}$$

to

$$\int dx\ \frac{-1}{2}(\partial_{\mu} \phi^{\nu})^2 + \frac{1}{2}(\partial_{\mu} \phi^{\mu})^2 $$

I assume it has something to do with integration by parts but I can't see it

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# I Proca Lagrangian

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