The functions are  and .

(a)

Verify that  and  are inverse function.

Two function are said to inverse function if and if .

Consider .

.

Consider .

.

As ,  and  are inverse functions.

(b)

Graph :

Graph the functions  and .

Observe the graph,

The two functions are symmetrical about the line .

 and  are inverse functions.

(a)  and  are inverse functions.

(b) Graph of the functions is

The two functions are symmetrical with respect to the line .