Im currently writing an undergraduate physics report, collaborating with a large group of people. One of our sections requires some LONG lagrangian derivations for various systems. Now, everyone always seems to insist on using the passive voice for physics reports, but in my opinion, in a long derivation it is incredibly clumsy. I'd like some professional opinion on this matter, thank you.

example sentence:

active:
"we now write the lagrangian in terms of the generalised coordinates alpha and phi"

passive:
"the lagrangian was written in terms of the generalised coordinates...."