$\"\"$

\

The expression is $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Prove the limit $\"\"$ using $\"\"$ definition.

\

To show that for each $\"\"$ , there exists a $\"\"$ such that $\"\"$ whenever $\"\"$ .

\

Consider $\"\"$

\

$\"\"$

\

Consider $\"\"$

\

$\"\"$

\

$\"\"$

\

Observe the relationship between two absolute values $\"\"$ and $\"\"$ .

\

Consider $\"\"$

\

$\"\"$

\

Therefore $\"\"$

\

$\"\"$

\

$\"\"$ .