Question: Let u1; : : : ;un be orthogonal vectors in Rn. Prove that jju1 + + unjj2 = jju1jj2 + + jjunjj2

Let u1; : : : ;un be orthogonal vectors in Rn. Prove that jju1 + + unjj2 = jju1jj2 + + jjunjj2

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