YOU need to show YOUR best attempt to work YOUR homework. We can then see where you are going wrong and try to get you back on course.
It's looking increasingly like the TS doesn't know what it means, either. They just want someone to work their homework for them. Actually understanding what is being asked isn't needed for that.In particular you need to tell us or provide a truth table for the operation indicated by the circle with a small dot inside in expression number 3. Whatever it is, it is non-standard, and we are not mind readers, so help us out here if you can.
You're right the circumpunct symbol is rarely used. It's right up there with the Sheffer Stroke, the Peirce Arrow, and the Quine Dagger which are a couple of obscure names for the more familiar NAND and NOR functions.
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by Jake Hertz