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[" If "vec a" and "vec b" are two unit v...

[" If "vec a" and "vec b" are two unit veetors such that "],[(vec a+vec b)" is also a unit veetor,then angle betwee "],[vec a" and "vec b" is "],[[" (a) "(pi)/(3),(b)-(pi)/(3)," (c) "(21)/(3)(d)" None of these "]]

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