If in `Delta ABC, (a -b) (s-c) = (b -c) (s-a)`, prove that `r_(1), r_(2), r_(3)` are in A.P.

In Delta ABC, if (a-b)(s-c)=(b-c)(s-a) then r_(1),r_(2),r_(3) are in

In Delta ABC, if (a-b) (s-c)= (b-c) (s-a) then r_1,r_2,r_3 are in

In a /_ABC if (s-a)/(a-b)=(s-c)/(b-c) then r_(1),r_(2),r_(3) are in AP

In a triangle ABC, if (a-b)/(b-c)= (s-a)/(s-c) , then r_1,r_2,r_3 are in

Lengths of the tangents from A,B and C to the incircle are in A.P., then (a) r_(1), r_(2), r_(3) are in H.P (b) r_(1), r_(2), r_(3) are in A.P (c)a, b, c are in A.P (d) cos A = (4c -3b)/(2c)