Use Exercise 91 to show that v and w are orthogonal if and only if v
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Use Exercise 91 to show that v and w are orthogonal if and only if ΙΙv − wΙΙ = ΙΙv + wΙΙ.
Data From Exercise 91
Prove that ΙΙv + wΙΙ2 − ΙΙv − wΙΙ2 = 4v · w.
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