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

In any DeltaABC , prove that (sin B)/(sin(B+C) ) = b/a

In any DeltaABC , prove that (sinA)/(sin(A+B))=a/c

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

In a DeltaA B C prove that cos ((A+B)/2)=sin (C/2).

In any DeltaABC , prove that asin""1/2(B-C)=(b-c)cos""1/2A

In any DeltaABC, sum a^(2) (sin^2 B - sin^2 C) =

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

In any DeltaABC , prove that : (cos A)/a + a/(bc) = (cos B)/b + b/(ca) = (cos c)/c + c/(ab)

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

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