$\"\"$

The integral is $\"\"$ .

Volume of the solid obtained by rotating the curve $\"\"$ and $\"\"$ about the $\"\"$ axis in the interval $\"\"$ is

$\"\"$ .

Compare the integral $\"\"$ with $\"\"$ .

$\"\"$

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

$\"\"$

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