$\"\"$

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

Alternative form of derivative at $\"\"$ : $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

Graph :

Graph the function $\"\"$ :

$\"\"$

Observe the graph:

As $\"\"$ approaches to $\"\"$ from left hand side, $\"\"$ tends to $\"\"$ .

As $\"\"$ approaches to $\"\"$ from right hand side, $\"\"$ tends to $\"\"$ .

Since $\"\"$ does not approaches to a particular value, $\"\"$ is not differentiable at $\"\"$ .

The derivative of the function at $\"\"$ does not exist.

$\"\"$

The derivative of the function at $\"\"$ does not exist.