What is the pronunciation of Formulæ in Latin ?
Is there any difference (in pronunciation) between classical and vulgar Latin ?
The answer can be in International Phonetic Alphabet (IPA) format.
formŭla , ae
The tonal accent is on the first syllable as in English.
for- the -r- should be heard; o as in note/ Fr. nôtre.
-mŭ- short 'u' as in 'foot' (no intrusive y, or j )
-lae ae as 'ai' in aisle; [ae becomes e, 'é' in mediaeval L. ].
(This answer is based on a 1960 schoolbook; choirmasters, revisionists, recidivists, and historians have ruined my ear for any 'correct' pronunciation)