Question

if A+B+C=180 degree and sin {A+(C÷2)} =n×sin( C÷2) then what is the value of sin(C÷2) ÷[cos (A÷2)× cos(B÷2)]? ​

Answer 1

$x_{123} \alpha \sqrt{x} \sqrt{x} \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]$