Задание
В треугольнике \(\displaystyle ABC{\small:}\)
- \(\displaystyle BC=a\small,\)
- \(\displaystyle \angle C=\gamma\) и \(\displaystyle \angle B=\beta\small.\)
Выразите биссектрису \(\displaystyle AL\) через \(\displaystyle \gamma,\,\beta\) и \(\displaystyle a{\small:}\)
\(\displaystyle AL=\) [ ]