Usage History of 'formulae'

The following chart shows how frequently 'formulae' appeared in printed materials over time. For example, the word 'formulae' occurred 6 times in books in 1574 and 94,672 times in 2008. From 1574 to 2008, the word 'formulae' was used a total of 3,841,508 times in books scanned by Google. See Reference: Google Ngram project.

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