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In A B C , the coordinates of the verte...

In ` A B C` , the coordinates of the vertex `A` are `(4,-1)` , and lines `x-y-1=0` and `2x-y=3` are the internal bisectors of angles `Ba n dC`.Then, the radius of the encircle of triangle `A B C` is (a) `4/(sqrt(5))` (b) `3/(sqrt(5))` (c) `6/(sqrt(5))` (d) `7/(sqrt(5))`

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