If in DeltaABC,vec(AB)=(vec(u))/(u)-(vec...

If in `DeltaABC,vec(AB)=(vec(u))/(u)-(vec(v))/(v)` and `vec(AC)=(2vec(u))/(u)`, where `vec(u) ne vec(v)`, then

A

`1+cos 2A+cos 2B+cos 2C=0`

B

`1+cos 2A+cos 2B+cos 2C=2`

C

Both (a) and (b) are correct

D

None of these

Text Solution

Verified by Experts

The correct Answer is:

A

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