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[" If "bar(a)" and "vec b" are vectors in space given by "bar(a)=(hat i-2hat j)/(sqrt(5))" and "vec b=(2hat i+hat j+3hat k)/(sqrt(14))" ,then the value of "],[(2vec a+vec b)*[(bar(a)timesvec b)times(bar(a)-2bar(b))]" is ".........]

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