Coordinate Geometry: JEE Main 2026 Mathematics question

Let the line $L_1: x+3=0$ intersect the lines $L_2: x-y=0$ and $L_3: 3x+y=0$ at the points A and B, respectively. Let the bisector of the obtuse angle between the lines $L_2$ and $L_3$ intersect the line $L_1$ at the point C. Then $BC^2:AC^2$ is equal to: