It seems like you might be referring to "fita," but without additional context, it's unclear what you're asking about. "FITA" could be an acronym or related to various fields such as mathematics, finance, or specific formulae in different subjects.
If "fita" relates to a specific mathematical function, formula, or concept, please provide additional details to assist you better. If it refers to something else, such as fitness, archery (FITA is the acronym for the International Archery Federation), or any other context, please clarify, and I'll do my best to provide you with the relevant formula or information!