$\"\"$

\

The function is $\"\"$ .

\

Substitute $\"\"$ for $\"\"$ .

\

$\"\"$

\

Difference quotient of $\"\"$ $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

$\"\"$

\

Difference quotient of $\"\"$ is $\"\"$ .