This is the 12186th most frequent Spanish word.
inversa
"Inverse" or "opposite."
In this sentence, 'inversa' is used as an adjective describing the operation that counteracts another operation, in this case, subtraction as the inverse of addition.
La operación inversa de la suma es la resta.
The inverse operation of addition is subtraction.
Here, 'inversa' modifies 'función' to specify the mathematical concept of an inverse function.
El diseño de la máquina requiere un análisis minucioso de la función inversa.
The design of the machine requires a thorough analysis of the inverse function.
In this instance, 'inversa' relates to the manner or direction, indicating a reversal of the standard or current state.