5. Let ū = -5j, v = v2i- v2j. (a) Find ū · v (b) Find |ū], || (c) If 0 is the angle between u and v, find cos 0. (d) Find 0. Answer: ü.ㅎ3 5v2; I미 = 5, 1히 =D2;cos θ=,0=D 45°

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