In a `Delta ABC` If A-B=`120^(@)`,R=8r then `8cos C=`

In a triangle ABC, If A=B=120^(@) and R=8r, then the value of cosC is

In DeltaABC," if " A-B=120^(@) and R=8r , then the value of (1+cosC)/(1-cosC) equals : (All symbols used hav their usual meaning in a triangle)

In Delta ABC, if C=90^(@), then R+r=

In Delta ABC if /_C=90^(@) then R+r=

In a triangle ABC, A - B =120 ^(@) and R = 8r, then the value of cos C is

In Delta ABC ,if a=2, B=120^(@),C=30^(@) then area of Delta ABC is

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 Delta ABC if 5r=2R then cos A+cos B+cos C=

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

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.