$\"\"$

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

Definition of absolute function : $\"\"$ .

The piecewise function is $\"\"$ .

If $\"\"$ then the function is $\"\"$ .

$\"\"$

If $\"\"$ then the function is $\"\"$ .

$\"\"$

Left hand limit and right hand limit are equal, so $\"\"$ is exist.

$\"\"$ .

$\"\"$

$\"\"$ .