* Let u and v be orthogonal vectors in R and let w = 3u + 7v. Suppose that u = 63 and M = 3. Find the cosine of the angle between w and v. (A) (B) 78 (C) 78 N 79 (E) V82 (F) (G) 82 V83 (H) 83 V19 (D) 20 79 38

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