$\"\"$

The function is $\"\"$ .

Graph the function:

$\"\"$

Observe the graph.

As $\"\"$ tends to $\"\"$ , $\"\"$ approaches to $\"\"$ .

$\"\"$ .

$\"\"$

The function is $\"\"$ .

Domain:

Denominator of the function should not be zero.

Denominator is zero at $\"\"$ .

Domain: $\"\"$ .

Graphically the value of the function exist at $\"\"$ .

Analytically the value of the function does not exists.

That is the advantage of calculating domain analytically.

$\"\"$

Domain $\"\"$ .

$\"\"$ .