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Prove that the four points with position...

Prove that the four points with position vectors `2vec(a) + 3vec(b) - vec(c), vec(a) - 2vec(b) + 3vec(c) " , "3vec(a) + 4vec(b) - 2vec(c)` and `vec(a) - 6vec(b) + 6vec(c)` are coplanar.

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