If A, B, C, D are the four angle taken in order of a cyclic quadrilateral, prove that
(i) `tan A + tan B + tan C + tan D = 0`

If A, B, C, D are the four angle taken in order of a cyclic quadrilateral, prove that (iv) tan (A + B) + tan (C + D) = 0 .

If A,B,C,D are the four angles taken in order of a cyclic quadrilateral prove that tan A+tan B+tan C+tan D=0

If A,B,C,D are the four angles taken in order of a cyclic quadrilateral prove that (i)tan A+tan B+tan C+tan D=0 (ii) cos(180^(@)-A)+cos(180^(@)+B)+cos(180-C^(@))-sin(90+D)tan(A+B)+tan(C+D)=0tan(A+B)+tan(C+D)=0

If A, B, C, D are the four angle taken in order of a cyclic quadrilateral, prove that (iii) cos A + cos B + cos C + cos D = 0

A, B, C, D are the four angles, taken in order of a cyclic quadrilateral. Prove that, cot A + cot B + cot C + cot D = 0

In a cyclic quadrilateral ABCD, find the value of tanA/2tan B/2 tan C/2 tan D/2 .

(a) tan A+tan B+tan C=tan A tan B tan C

If A, B, C, D be the angles of a cyclic quadrilateral, taken in order, prove that : cos A + cos B + cos C+ cos D = 0 .

If A, B, C, D be the angles of a quadrilateral, prove that : (tanA+tanB+tanC+tanD)/(cotA+cotB+cotC+cotD) = tan A tan B tan C tan D

If A, B, C, D be the angles of a quadrilateral, prove that : (tanA+tanB+tanC+tanD)/(cotA+cotB+cotC+cotD) = tan A tan B tan C tan D