The functions are  and .

A function  is the inverse of the function  if   for each  in the domain of  and  for each  in the domain of .

.

. 

Since , the functions  and  are inverse functions.

Graph:

Graph the two functions.

Draw the coordinate plane.

Graph the curve and .

Observe the graph:

 and  have reflective property.

And the graphs of the two functions symmetric about the line .

Hence the functions  and  are inverse functions of each other.

 and  are inverse functions.