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1. If the composite functions f(g(x)) and g(f(x)) both equal to x, then the function g is the Inverse function of f.

   What is the inverse of a function?

   A function that can reverse into another function is known as an inverse function or anti-function. In other words, the inverse of a function “f” will take y to x if any function “f” takes x to y. 

   Let us take the Example.

   Suppose f(x)= x/4 and g(x)=4x.

   Let x=1

   then f(g(x))= f(g(1))=f(4)=1

   and g(f(x))=g(f(1))=g(1/4)=1

   Here, f(g(x))=g(f(x))=1

   Therefore , we can say that f(g(x)) and g(f(x)) are inverse of each other.

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