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bar(a), bar(b), bar(c) are non-coplanar ...

`bar(a), bar(b), bar(c)` are non-coplanar vectors. Prove thate the following four points are coplanar
`- bar(a) + 4 bar(b) - 3 bar(c) , 3 bar(a) + 2 bar(b) - 5 bar(c)`
`- 3 bar(a) + 8 bar(b) - 5 bar(c) , - 3 bar(a) + 2 bar(b) + bar(c)`

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