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If bar(a) and bar(b) any two non-colline...

If `bar(a)` and `bar(b)` any two non-collinear vectors lying in the same plane, then prove that any vector `bar(r)` coplanar with them can be uniquely expressed as `bar(r)=t_(1)bar(a)+t_(2)bar(b)`, where `t_(1)andt_(2)` are scalars.

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