The curve is and the lines are
,
.
Region is rotated about -axis.
Method of Cylinders :
\The volume of the solid obtained by rotating about -axis, the region of the curve
from
to
is
.
Rewrite the curve as
.
Find the point of intersections.
\Find the values of for
and
.
Integral limits are and
.
Find the volume obtained by rotating region about -axis, bounded by the curves
and
from
to
is
.
.
Volume of the solid is .
Volume of the solid is .