If `r_1,r_2,r_3` are the radii of the escribed circlesof a `DeltaABC` and ifr is the radius of its incircle then `r_1r_2r_3-r(r_1R_2+r_2r_3+r_3r_1)=`

If r_(1),r_(3),r_(1) are the radii of the escribed circles of a DeltaABC and if r is the radius of its incircle then r_(1)r_(2)r_(3)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))=

If r_1 , r_2 , r_3 are the radii of the escribed circles of a Delta ABC and if r is the in radius then r_1r_2r_3-r( r_1r_2+r_2r_3+r_3r_1)

If r_(1), r_(2), r_(3) are radii of the escribed circles of a triangle ABC and r it the radius of its incircle, then the root(s) of the equation x^(2)-r(r_(1)r_(2)+r_(2)r_(3)+r_(3)r_(1))x+(r_(1)r_(2)r_(3)-1)=0 is/are :

( r_1+ r_2) (r_2+r_3) (r_3+r_1) =

a( r r _1 +r_2r_3) =