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If vec(r )= x vec(i) + y vec(j) + z vec(...

If `vec(r )= x vec(i) + y vec(j) + z vec(k)` then find `(vec(r ) xx vec(i))^(2)- (vec(r )xx vec(k))^(2)`

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The correct Answer is:
`z^(2)-x^(2)`
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