Unite-Minus Front-Intersect-Exclude
Divide-Trim-Merge-Crop-Outline-Minus Back
Using pathfinder to create a perfect circular mirrored logo effect
Draw a oval
Copy oval and change color
offset the two shapes
select both shapes
in the pathfinder pallette, choose "Minus Back"
select the remaining "sliver" shape and copy it
paste a new version and change the color
rotate 180 and move into position to complete the circle