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If vec(a),vec(b),vec(c) are unit coplana...

If `vec(a),vec(b),vec(c)` are unit coplanar vectors, then `[2vec(a)-vec(b).2vec(b)-vec(c).2vec(c)-vec(a)]=`

A

0

B

1

C

`-sqrt(3)`

D

`sqrt(3)`

Text Solution

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The correct Answer is:
A
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