The plural form of the word 'formula' can be either 'formulas' or 'formulae', depending on the context. 'Formulas' is commonly used in general and especially in American English while 'formulae' is often used in scientific and mathematical contexts, and more in British English. However, both are grammatically correct, so you can choose the one that suits your preference and the context of your writing. Isn't language fun and versatile?
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