Question
Prove that the four projections of vertex A of the triangle ABC onto the exterior
and interior angle bisectors of B and C are collinear.
Joshi sir comment
in the given diagram red lines are angle bisectors (interior and exterior)and X, Y, Z, W are the projections of A on these red lines
by angle bisector property all these 4 points will lie on the line BC (either externally or internally) so these points will be in a line