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[" Let "vec a,vec b,vec c" are the three...

[" Let "vec a,vec b,vec c" are the three "],[" vectors such that "],[|vec a|=|vec b|=|vec c|=2" and angle "],[" between "vec a" and "vec b" is "pi/3,vec b" and "],[vec c" is "pi/3" and "vec a" and "vec c" is "pi/3.],[" Then which of the following is "],[" incorrect? "]

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