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

In any DeltaABC , prove that ((b+c))/acos""((B+C))/2=cos""((B-C))/2

In DeltaABC , prove that: (b+c)cos(B+C)/(2)=acos(B-C)/(2)

For any triangle ABC, prove that (b+c)cos(B+C)/(2)=a cos(B-C)/(2)

In any Delta ABC, prove that :2(b cos^(2)((C)/(2))+c cos^(2)((B)/(2)))=a+b+c

In any Delta ABC, prove that :a(b cos C-c cos B)=b^(2)-c^(2)

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

In DeltaABC , prove that: (bcos^(2)C)/2+(c cos^(2)B)/2=s

In DeltaABC , prove that: acosA+bcosB=(c)cos(A-B)

In any DeltaABC , prove that a(bcosC-c cosB)=(b^(2)-c^(2))

In any Delta ABC, prove that: (cos^(2)((A)/(2)))/(a)+(cos^(2)((B)/(2)))/(b)+(cos^(2)((c)/(2)))/(c)=(s^(3))/(abc)