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In a triangle ABC, if A-=(1,2) and the i...

In a triangle ABC, if A-=(1,2) and the internal angle bisectors through B and C are y=x and y=-2x, then the inradius r of `DeltaABC` is

A

`1//sqrt3`

B

`1//sqrt2`

C

`2//3`

D

`sqrt(2/3)`

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