||x||=4, ||y||=5,<x,y>=8.
What is the cauchyshwarz inequality? <This was relatively straight forward.. Not too sure about the rest however..
What is the norm of 4x-4y?
What is the cosine angle between x and 4x-4y?
Find λ, such that 2x-y and λx-y are orthogonal?

Many thanks