In ΔABC the value of sinA+sinBsinC=
If sin (B + C − A), sin (C + A − B), sin (A + B − C) are in A.P., then cot A, cot B and cot C are in (a) GP (b) HP (c) AP (d) None of these
If sin(B+C−A),sin(C+A−B),sin(A+B−C) are in A.P., then cot A, cotB, cotC are in