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If f is the centre of a circle inscribed...

If `f` is the centre of a circle inscribed in a triangle `ABC`, then `|vec(BC)|vec(IA)+|vec(CA)|vec(IB)+|vec(AB)|vec(IC)` is

A

zero

B

`(vec(IA)+ vec(IB)+vec(IC))/3`

C

`3(vec(IA)+ vec(IB)+vec(IC))`

D

None of these

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