In a cyclic quadrilateral ABCD, prove that `tan ^(2)""(B)/(2)=((s-a)(s-b))/((s-c)(s-d)),a,b,c, and
Channel: Doubtnut
Date: 24/05/2020

In a cyclic quadrilateral ABCD, prove that `tan ^(2)""(B)/(2)=((s-a)(s-b))/((s-c)(s-d)),a,b,c, and d` being the lengths of sides ABC, CD and DA respectively and s is semi-perimeter of quadrilateral.