Question

Найдите длину биссектрисы

Answer 1

$\frac{1}{3+9}\sqrt{3*9((3+9)^{2} -(4\sqrt{6})^{2})}=\frac{1}{12}*\sqrt{3*9*(12^{2}-16*6)}=\frac{1}{12}*\sqrt{3*9*(144-96)}=\frac{1}{12}*\sqrt{3*9*48}=\frac{1}{12}*\sqrt{3*9*3*16}=\frac{1}{12}*3*3*4=\frac{3*12}{12}=3$