$\"\"$

\

The function of hte parabola is $\"\"$ .

\

The area enclosed by parabola ,the $\"\"$ -axis and the lines are $\"\"$ and $\"\"$ is

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Substitute $\"\"$ in $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ in $\"\"$ .

\

$\"\"$

\

Substitute $\"\"$ in $\"\"$ .

\

$\"\"$

\

Therefore $\"\"$

\

$\"\"$

\

Hence $\"\"$ .

\

$\"\"$

\

$\"\"$ .