OK, basic dw question here

Taping the joints is simple and basic when it comes to two uncut edges which
are tapered and abutted.

However, in many cases, you have two CUT pieces where full-thickness edges
come together.

What is the best way to deal with these?

Adding tape and mudding over could leave a "bulge" if nothing is done.

Does one take a mallet and "ding in" the edges? Taper them somewhat with a
knife?

Also, any links to sites which tell how to deal with drywall finishing in
this way would be helpful.