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

If `bar(a)=2bar(i)-3bar(j)+5bar(k),bar(b)=-bar(i)+4bar(j)+2bar(k)`, then find `(bar(a)+bar(b))xx(bar(a)-bar(b))` and unit vector perpendicular to both `bar(a)+bar(b)andbar(a)-bar(b)`

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