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If vec(a),vec(b),vec(c ) are non-coplana...

If `vec(a),vec(b),vec(c )` are non-coplanar vectros, then prove that the four points
`-vec(a) + 4vec(b)-3vec(c ), 3vec(a) +2vec(b)-5vec(c ), -3vec(a) +8vec(b)-5vec(c )` and `-3vec(a)+2vec(b)+vec(c )` are complanar.

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