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[" 39.Let "vec a,vec b" and "vec c" be t...

[" 39.Let "vec a,vec b" and "vec c" be three non-Zero vectors "],[" such that no two of them are collinear and "],[(vec a timesvec b)timesvec c=(1)/(3)|vec b|vec c|vec a" .If "theta" is the angle "],[" between vectors "vec b" and "vec c," then a value of "],[sin theta" is "],[[" (a) "(2sqrt(2))/(3)," (b) "(-2sqrt(2))/(3)],[" (c) "(2)/(3)," (d) "(-2sqrt(2))/(3)],[" (c) "," (b) "(-2sqrt(2))/(3)],[" (c) ",],[,]]

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