Answer: It's going to be used in calculus.
Step-by-step explanation:
The purpose of those functions are going to be used later to solve calculus equations like integral of some function and you need to use inverse trig functions to solve for the integral of a function, they just teach it for you early so when the professor goes on about the subject you won't be confused.
Depending on your school or class, you might start learning it at grade 11 or you won't see it at school at all and it will come later in uni.
so depending on what you want to do, it won't serve a purpose or it will help you a bunch later on in math.
