Use pT = P and p2 = P to prove that the length squared of column 2 always equals the

Chapter 4, Problem 28

(choose chapter or problem)

Use pT = P and p2 = P to prove that the length squared of column 2 always equals the diagonal entry P22 . This number is ~ = 3~ + 3~ + 3~ for P=! 2 2 2. [ 5 2 -1]

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