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If bar(a) = 2bar(i) - 3bar(j) + 5bar(k),...

If `bar(a) = 2bar(i) - 3bar(j) + 5bar(k), bar(b) = -bar(i) + 4bar(j) + 2bar(k)` then find `bar(a) xx bar(b)` and unit vector perpendicular to both `bar(a), bar(b) [-26bar(i) - 9bar(j) + 5bar(k), +- 1/(sqrt(782))26bar(i)+9bar(j)-5bar(k))`.

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