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If bar(a) = 2bar(i) + 3bar(j) + 4bar(k),...

If `bar(a) = 2bar(i) + 3bar(j) + 4bar(k), bar(b) = bar(i) + bar(j) -bar(k), bar(c ) = bar(i) - bar(j) + bar(k)`, compute `bar(a)x(bar(b)xbar(c ))` and verify that it is perpendicular to `bar(a)`.

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