" xii) "(a-c cos B)/(b-c cos A)=(sin B)/(sin A)quad (" UP "2004,06

(b-a cos c)sin A=a cos A sin c

a cos A + b cos B + c cos C = 2a sin B sin C

cos(A+B)+sin C=sin(A+B)-cos C

a.cos A + b.cos B + c.cos C = 2a sin B sin C

In triangle ABC, if (2(sin B-sin C))/((cos B+cos C))=(sin A)/(1-cos A) then the value of (b)/(c). is equal to

(cos A)/(sin B sin C)+(cos B)/(sin C sin A)+(cos C)/(sin A sin B)=2

Prove that a cos A+b cos B+c cos C=4R sin A sin B sin C

if A + B + C = pi then (cos A) / (sin B sin C) + (cos B) / (sin C sin A) + (cos C) / (sin A sin B) =

Prove that (sin(B-C))/(cos B cos C)+(sin(C-A))/(cos C cos A)+(sin(A-B))/(cos A cos B)=0