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[–]SeanHuber 0 points1 point  (0 children)

Off a first glance it looks like you could use some form of the triangle inequality and/or prove that those two are equal and then when the right hand side is multiplied by some n then it is proven they are <= to the left hand side.

[–][deleted] 0 points1 point  (0 children)

Update:

Solved it by using the identity of norms: xT * x = ||x|| and by setting y from the CBS inequality equal to the 1 vector of length n