In `/_\ABC`, if `a:b:c=3:5:7`, then `cos A+cos B=`

In Delta ABC of a :b:c= 7 : 8: 9 .Then cos A : cos B is equal to :-

In a o+ABC, if a=3,b=5 and c=7, find cos A,cos B and cos C

In a ABC, prove the following : In a ABC, if a=18,b=24,c=30, find cos A,cos B and cos C.

In triangle ABC, if b=3, cos A=3/5 and cos B=5/13 then find the value of (5c)/2

If in a Delta ABC,/_B=(2 pi)/(3) then cos A+cos C lie in

If in Delta ABC,/_B=2(pi)/(3), then cos A+cos C lie in

With usual notations, if in a triangle ABC (b+c)/(11) = (c+a)/(12) = (a+b)/(13) , then cos A : cos B : cos C is :

In Delta ABC a =5 ,b=3 ,c=7 .Then value of 3coC +7 cos B is equal :-

In /_ABC, if cos A+cos B+cos C=(7)/(5) and 2R=mu r, then the value of mu is