`vec(a),vec(b),vec(c)` are the three coplanar vectors and if `vec(r).vec(a)=vec(r).vec(b)=vec(

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`vec(a),vec(b),vec(c)` are the 0:02:48

`vec(a),vec(b),vec(c)` are the three coplanar vectors and if `vec(r).vec(a)=vec(r).vec(b)=vec(

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`vec(a),vec(b),vec(c)` are the three coplanar vectors and if `vec(r).vec(a)=vec(r).vec(b)=vec(

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