In `Delta ABC` if `tan((B+C-A)/4)tan((C+A-B)/4)tan((A+B-C)/4)=1` then find the value of `cos A+ cos B+cos C `

If A+B+C= pi and "tan" (B+C-A)/(4) "tan" (C+A-B)/(4) *"tan" (A+B-C)/(4)=1 , then prove that cosA+ cos B+ cos C=-1

In Delta ABC,a=4,b=6,c=8, then find the value of 8cos A+16cos B+4cos C

In Delta ABC , if ( sin A)/(4) = (sin B)/(5) = (sin C)/( 6) then the value of cos A +cos B +cos C =

In Delta ABC, if tan ""(A)/(2), tan""(B)/(2) , tan""(C)/(2) are in A.P. then cos A , cos B , cos C are in

Let A,B,C be the three angles such that A+B+C=pi , tan A.tan B=2 , then find the value of (cos A cos B)/(cos C)

Let A,B,C be the three angles such that A+B+C=pi , tan A.tan B=2 , then find the value of (cos A cos B)/(cos C)

In a /_ABC, if (tan A)/(2),(tan B)/(2),(tan C)/(2)are in Adot P; then show that cos A,cos B,cos C are in AP

In a Delta ABC right angled at B, if tan A = (1)/( sqrt(3)) , find the value of cos A cos C - sin A sin C

In Delta ABC , right angled at B . If tan A= (1)/(sqrt3) , find the value of sin A. cos C+ cos A sin C .