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

If `bar(a)=2bar(i)+bar(j)-bar(k), bar(b)=-bar(i)+2bar(j)-4bar(k), bar(c )=bar(i)+bar(j)+bar(k)` then find `(bar(a)xxbar(b)).(bar(b)xxbar(c ))`.

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