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Use "formulae" in a sentence
"Mathematics is proven to be absolutely perfect and demonstrates in formulae that there are infinite degrees beyond the four we obviously know."
"The writings of Apostles and Evangelists, the Discourses of our Divine Lord Himself, abound in short formulae; and the intervening matter on such occasions is constantly an integral sentence, which occasionally may be discovered from its context without evident injury to the general meaning of the place."
"Those who didn’t like what he wrote followed him around until he was observed ripping several pages containing formulae from a book in the Royal Institute library."