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

If `bar(a) = bar(i) + 2bar(j) + 3bar(k), bar(b) = 3bar(i) +5bar(j) -bar(k)` are 2 sides of a triangle, find its area.

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The correct Answer is:
`(sqrt(390))/(2)`
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