$\"\"$

The integral is $\"\"$ .

Volume of the solid, obtained by rotating about $\"\"$ -axis, the region under the curve $\"\"$ from $\"\"$ to $\"\"$ is

$\"\"$ .

Re-write the integral $\"\"$ as $\"\"$ .

Compare the above expression with volume of the solid fromula.

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

Solid obtained by rotating the region $\"\"$ about $\"\"$ -axis.

$\"\"$

Solid obtained by rotating the region $\"\"$ about $\"\"$ -axis.