$\"\"$

The expression is $\"\"$ .

Graph the function $\"\"$ .

$\"\"$

Observe the graph:

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

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

Since left hand side limit is equal to right hand side limit, then the limit exists.

$\"\"$ .

$\"\"$

Draw a table to find the value of the limit.

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$
$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$

Observe the table:

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

$\"\"$

The expression is $\"\"$ .

$\"\"$

Apply special trigonometric limits $\"\"$ .

$\"\"$

$\"\"$ .

$\"\"$

$\"\"$ .