The problem says to insert brackets to make this a true statement
I know that:
I'm not sure how to proceed from here, apart from brute force. A hint would be appreciated.
Actually, I think that at first I was telling myself that the RHS needed parentheses. Making parentheses over the last 2 sqrt(2) wouldn't have made the problem easier. So if there were, it should have been over the first two sqrt(2)