^2, *2, and x2 are the same exact things. But the difference is that you can't write down *2 on an actual math assignment and not look weird, but you can write down ^2, ( Have you ever wondered what that symbol is actually used for? Well, that's it. ), x2, and X 2.
Actually ^2 would mean "times 2" not "squared" The correct way is E=mc2
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