If `ABCD` is a quadrilateral then `tan((A+B)/4)`

If ABCD is a quadrilateral then Sec^(2) ((A+B)/(4))- Cot^(2) ((C+D)/(4))=

If ABCD is a cyclic quadrilateral, then tan A +tan C =_________.

ABCD is a quadrilateral, then /_A+/_B+/_C+/_D=

If A,B,C,D are the angles of a quadrilateral then tan""((A+B)/(4))=

If ABCD is a cyclic quadrilateral, then cos A + cos B is equal to

ABCD is a cyclic quadrilateral and tan (A/2) tan (C/2) + tan (B/2) tan (D/2) equals_____

If ABCD is a cydic quadrilateral such that 12 tan A - 5 = 0 and 5 cos B + 3 = 0, then cos C tan D =

If ABCD is a convex quadrilateral such that 4 sec A+5 =0 then the quadratic equation whose roots are tan A and cosec A is

If ABCD is a convex quadrilateral such that 4 sec A+5 =0 then the quadratic equation whose roots are tan A and cosec A is

If ABCD is a convex quadrilateral such that 4 sec A+5 =0 then the quadratic equation whose roots are tan A and cosec A is