This is the 579th most frequent Ukrainian word.
f
The Ukrainian language does not have a standalone word "f." It is a letter in the Ukrainian alphabet.
In this sentence, 'formulas' involves a mathematical context where the word 'f' refers to 'formulas'.
У мене є лише дві формули для рівняння.
I only have two formulas for the equation.
Here, 'factory' introduces an industrial context; 'f' forms part of the word 'factory'.
На фабриці працює близько п'ятдесяти співробітників.
About fifty employees work at the factory.
In this instance, 'focuses' is used to describe concentration, where 'f' is the starting letter of the verb 'focuses'.