Question: 3.23 Angle between two nonnegative vectors. Let a: and y be two nonzero nvectors with nonnegative entries, i.e., each an 2 O and each yz-

3.23 Angle between two nonnegative vectors. Let a: and y be two nonzero nvectors with nonnegative entries, i.e., each an 2 O and each yz- Z O. Show that the angle between a: and y lies between 0 and 90. Draw a picture for the case when n = 2, and give a short geometric explanation. When are x and y orthogonal

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