Question

If A, B and C be the angles of a triangle, the incorrect relation is?
A+B
(A) sin(A+B/2) = cos(C/2)
(B) cos(A+B/2) = sin(C/2)
(C) tan(A+B/2) = sec(C/2)
(D) cot(A+B/2) = tan(C/2)​

Answer 1

hope it will help you,