In any `DeltaABC`, prove that `(sin B)/(sin C) = (c-a cos B)/(b-a cos C)`

In any Delta ABC, prove that: (sin B)/(sin C)=(c-a cos B)/(b-a cos C)

In any DeltaABC , prove that (c-bcosA)/(b-c cos A)=(cos B)/(cosC)

In any DeltaABC, prove that : (a^2 sin (B-C))/(sin A) + (b^2 sin (C-A))/(sin B) + (c^2 sin (A-B))/(sin C) = 0

In any DeltaABC , prove that ((a+b))/csin""C/2=cos""((A-B))/2

In DeltaABC , prove that: sin(B-C)/(2)=(b-c)/(a).cosA/2

In any Delta ABC, prove that :(b+c)cos A+(c+a)cos B+(a+b)cos C=a+b+c

In any DeltaABC , prove that ((a-b))/c"cos"C/2="sin"((A-B))/2

In any Delta ABC, prove that ”a cos”(B-C)/2=(b+c) “sin” A/2

In any DeltaABC , prove that ("sin(A-B)")/("sin(A+B)")=((a^(2)-b^(2)))/c^(2)

If any quadrilateral ABCD,prove that sin(A+B)+sin(C+D)=0cos(A+B)=cos(C+D)