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A function is any rule, on how one amount depends on another amount. To be a "function", for one input value (or set of input values), the output value must be uniquely defined.As for applications in real life, there are many. For example, the total cost of a number of products will depend on the amount you buy; the air pressure depends (to a great extent) on the altitude at which you are located; the area of a parcel depends on its length and on its width; etc.
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A use of periodic functions in real life?
determing current flow in ammeters
How does polynomial function exist in real life?
As with most advanced math, if your "real life" involves engineering work, you will use such math; otherwise, you will hardly have anything to do, in this case, with polynomial functions.
How are inverse trigonometric functions applied in real life?
They aren't. They aren't.
What is a real life exmple of periodic functions?
wheels, tide levels, temperature...
When will you use Square root functions in real life?
The diameter of a rectangular area is the square root of the length squared plus the width squared. D = √(L²+W²).
