$\"\"$

The function are $\"\"$ , $\"\"$ and $\"\"$ .

Squeeze theorem:

if $\"\"$ for all $\"\"$ in an open interval containing $\"\"$ , except possibly at $\"\"$ itself, and if $\"\"$ , then $\"\"$ exists and is equal to $\"\"$ .

Graph the three functions in a same window:

$\"\"$

Observe the graph:

$\"\"$ and $\"\"$ .

$\"\"$ .

$\"\"$

$\"\"$ .