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If bar(i), bar(j), bar(k) are unit vecto...

If `bar(i), bar(j), bar(k)` are unit vectors along the positive directions of the coordinate axes, then shown that the four points `4 bar(i) + 5 bar(j) + bar(k), - bar(j) - bar(k), 3 bar(i) +9 bar(j) + 4 bar(k) and - 4 bar(i) + 4 bar(j) + 4 bar( k)` are coplanar

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