[" If the sides "a,b,c" of a triangle "ABC" are the roots of the "],[" equation "x^(3)-13x^(2)+54x-72=0" ,then the value of "],[(cos A)/(a)+(cos B)/(b)+(cos C)/(c)" is equal to "]

If the sides a, b, c of a triangle ABC are the roots of the equation x^(3)-13x^(2)+54x-72=0 , then the value of (cosA)/(a)+(cosB)/(b)+(cosC)/(c ) is equal to :

If the sides a, b, c of a triangle ABC are the roots of the equation x^(3)-13x^(2)+54x-72=0 , then the value of (cosA)/(a)+(cosB)/(b)+(cosC)/(c ) is equal to :

In a Delta ABC, the value of (a cos A+b cos B+c cos C)/(a+b+c) is equal to

In a Delta ABC, the side a, b, and c are such that they are roots of x^(3) -11x ^(2) +38x -40=0. Then the value of (cos A)/(a )+ (cos B)/(b)+ (cos C)/(c ).

Let a,b and c be the sides of a Delta ABC. If a^(2),b^(2) and c^(2) are the roots of the equation x^(3)-Px^(2)+Qx-R=0, where P,Q&R are constants,then find the value of (cos A)/(a)+(cos B)/(b)+(cos C)/(c) in terms of P,Q and R.

In a Delta ABC,(cos A cos B)/(ab)+(cos B cos C)/(bc)+(cos C cos A)/(ca) is equal to

In Delta ABC,(cos C+cos A)/(c+a)+(cos B)/(b)=

In a Delta ABC(cos C+cos A)/(c+a)+(cos B)/(b) is