If α,β,γ are the lengths of internal bisectors of angles A,B,C respectively of ΔABC, then ∑1αcosA2 is:

If α,β,γ are the lengths of internal bisectors of angles A,B,C resp

1.	If α,β,γ are the lengths of internal bisectors of angles A,B,C respectively of ΔABC, then ∑1αcosA2 is:
Answer» If $α, β, γ$ are the lengths of internal bisectors of angles $A, B, C$ respectively of $Δ A B C$ , then $\sum \frac{1}{α} cos \frac{A}{2}$ is: