Ifa,b,care in HP . then, ab+bc=2ac.using this prove that sin2(A/2).sin2(B/2)+sin2(B/2).sin2(C/2)=2sin2(A/2).sin2(C/2)

Let assume later part is correct hence we have to prove a, b, c are in hp

X/2= (1-cosX)/2Use the cosine law to indulge the sides a,b,c into the eqn.Simplify to get the answer.²C/2...(AP)Write the average of this AP.Convert Sin²B/2, 1/Sin²A/2, 1/Sin²Write the AP average term in context to the HP given :1/Sin