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I' is the incentre of DeltaABC whose cor...

I' is the incentre of `DeltaABC` whose corresponding sides are a,b,c respectively. `aIA+bIB+cIC` is always equal to

A

`vec(AB) + vec(AB) + vec(CA)`

B

`a.vec(AB)+bvec(BC) +c(vecCA)`

C

`vec0`

D

None of these

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The correct Answer is:
C
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