The function is $\"\"$ , $\"\"$ , and $\"\"$ is undefined.

Substitute $\"\"$ in the function $\"\"$ .

$\"\"$

The value of $\"\"$ .

$\"\"$

The value of $\"\"$ is $\"\"$ .

Find $\"\"$ .

Substitute $\"\"$ in the function $\"\"$ .

$\"\"$ .

$\"\"$ is undefined, means that the denominator of $\"\"$ should be zero.

$\"\"$

The function is undefined at $\"\"$ .

The value of $\"\"$ is $\"\"$ and the value of $\"\"$ is $\"\"$ .