In `A B C ,(a b-r_1r_2)/(r_3),w h e r ea ,b ,r_1r_2, r_3, Randr` have usual meanings, is equal to (A)`R` (B) `2R` (C) `r` (D) none of these

In a !ABC , if r_(1) =2r_(2) =3r_(3) , then a:b:c =

If r,r_(1) ,r_(2), r_(3) have their usual meanings , the value of 1/(r_(1))+1/(r_(2))+1/(r_(3)) , is

In triangle ABC, if A - B = 120^(2) and R = 8r , where R and r have their usual meaning, then cos C equals

In a triangle ABC, if (a-b)/(b-c)= (s-a)/(s-c) , 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 , if r_(1) = 2r_(2) = 3r_(3) , then a/b + b/c + c/a is equal to

In triangle ABC, if A-B=120^(@) and R=8r, where R and r have their usual meanings,then cos C equal (a) (3)/(4) (b) (2)/(3)(c)(5)/(6) (d) (7)/(8)

In triangle ABC ,if (r_(1))/(6)=(r_(2))/(3)=(r_(3))/(2) ,where, r_(1),r_(2) and r_(3) are ex-radii, then find the value of (a)/(b)+(b)/(c)+(c)/(a) ?