1.

If vec(a)= vec(i) + vec(j) + vec(k), vec(b)= 2vec(i)-3vec(j) + vec(k), then (vec(a) xx vec(b))/(|vec(a) xx vec(b)|) + (vec(b) xx vec(a))/(|vec(b) xx vec(a)|)=

Answer»

`VEC(0)`
`2vec(i) + vec(J)-2vec(K)`
`vec(i)+vec(j) + 2vec(k)`
`vec(i) + 2vec(j) -vec(k)`

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