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[" 8.If "vec a,vec b,vec c" are unit vec...

[" 8.If "vec a,vec b,vec c" are unit vectors such that "vec a*vec b=0=vec a*vec c" and the angle between "vec b" and "vec c" is "pi/3" ,then the "],[" value of "|vec a timesvec b-vec a timesvec c|" is "],[[" a "1/2," b "1," c."2," d none of these "]]

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