1.

vec(a)= 3vec(i)- vec(j) + 2vec(k), vec(b)= -vec(i) + 3vec(j) + 2vec(k), vec(c )= 4vec(i)+ 5vec(j)- 2vec(k) and vec(d)= vec(i)+ 3vec(j) + 5vec(k), then compute (vec(a) xx vec(b)).vec( c) - (vec(a) xx vec(d)).vec(b)

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ANSWER :`-80`


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