\"\"

\

Method of washer :

\

The volume of the solid \"\" is \"\", where \"\" is the cross sectional area of the solid \"\".

\

\"\".

\

\"\"

\

The curves are \"\" and \"\" , \"\", about the \"\"- axis.

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\"

\

\"\".

\

\"\"

\

Volume is \"\".