If in a ΔABC angles A,B,C are in A.P then a+c√a2−ac+c2=
If A,B,C are the interior angles of a Δ ABC, show that:
(i) sin B+C2=cosA2
(ii) cos B+C2=sinA2
If A,B,C are interior angles of ΔABC then show that, sin(B+C)2=cosA2