In DeltaABC, prove that: `(c-bcosA)/(b-c cosA)=(cosB)/(cosC)`

In any Delta A B C , prove that: (cosA)/(bcosC+c cosB)+(cosB)/(c cosA+acosC)+(cosC)/(acosB+bcosA)=(a^2+b^2+c^2)/(2a b c)

In DeltaABC , prove that: a(cosC-cosB)=2(b-c)cos^(2)A/2

In DeltaABC , prove that: b(cosA-cosC)=2(c-a)cos^(2)B/2

In DeltaABC , prove that: (1+cosA.cos(B-C))/(1+cosC.cos(A-B))=(b^(2)+c^(2))/(a^(2)+b^(2))

In any DeltaABC , prove that (1+cos(A-B)cosC)/(1+cos(A-C)cosB)=(a^(2)+b^(2))/(a^(2)+c^(2))

In DeltaABC , prove that: (a-b)/c=(sin(A-B)/(2))/(cosC/2)

In DeltaABC , prove that: abc. cosA/2.cosB/2.cosC/2=Deltas

In DeltaABC , prove that: a(cosB+cosC)=2(b+c)sin^(2)A/2 .

In any DeltaABC , prove that a(cosC-cosB)=2(b-c)cos^(2)""1/2A

In DeltaABC , prove that: sin(A+B/2).cosB/2=(c+a)/(a+b)cosC/2.cos(A-B)/(2)