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[" If "vec a+vec b+vec c=vec 0,|vec a|=3,|vec b|=5,|vec c|=7," then "],[" the angle between "vec a" and "vec b" is "],[[" (a) "(pi)/(6)," (b) "(2 pi)/(3)," (c) "(5 pi)/(3)," (d) "(pi)/(3)]]

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