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[" if "vec a,vec b" and "vec c" are thre...

[" if "vec a,vec b" and "vec c" are three unit vectors with "vec a+vec b+vec c=0," then "],[vec a*vec b+vec b*vec c+vec c*vec a" is equal to "],[[" (a) zero "," (b) "1," (c) "-3/2," (d) none of these "]]

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