http://i952.photobucket.com/albums/a...g/P5270092.jpg

A circular hollow cone of height h and semi-vertical angle stands on a horizontal table. An upright cylinder of radius cm and height cm just fits into the cone as shown in the diagram.

First part of the question: Show that

Second part: Prove that the maximum possible volume of the cylinder is

I completed the first part and am facing problems with the second part