$\"\"$

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

Squeeze theore:

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 the same window.

$\"\"$

Observe the graph:

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

$\"\"$ .

$\"\"$

$\"\"$ .