$\"\"$

The functions are $\"\"$ and $\"\"$ .

Graph the functions $\"\"$ , $\"\"$ and $\"\"$ .

$\"\"$

Observe the graph:

The functions $\"\"$ and $\"\"$ are symmetrical about the line $\"\"$ .

Therefore, $\"\"$ is the inverse function of $\"\"$ .

$\"\"$

The function $\"\"$ is the inverse function of $\"\"$ .