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

[" 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 "]

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