The function is $\"\"$ .

$\"\"$ is in the form of composite function $\"\"$ .

$\"\"$

Definition of composite function :

The notation $\"\"$ means that the function $\"\"$ is applied first, $\"\"$ is second and then $\"\"$ .

Assume $\"\"$ .

$\"\"$

Now consider $\"\"$ .

$\"\"$

From the above expression $\"\"$ , $\"\"$ and $\"\"$ .

$\"\"$ , $\"\"$ and $\"\"$ .