How to get all the dependencies for a package

I'm trying to get all the dependencies for a package..for example apache2

I've tried to use apt-cache depends apache2 but it gives some dependencies but when I want to install apache2 on a live CD it asks even for more dependecies not listed in that command..

What I've found: that commands lists dependecies which in turn need dependecies (for example apache2 needs apache2-bin which needs libar1)

Is there any command to get all the dependencies???

ps: I've tried:

    apt-cache rdepends apache2
    apt-cache showpkg apache2