Y by Quidditch, PRMOisTheHardestExam, LoloChen, KST2003, trinhquockhanh, Rounak_iitr, Funcshun840, cubres
Let
be an acute-angled triangle with
. Let
be the circumcircle of
. Let
be the midpoint of the arc
of
containing
. The perpendicular from
to
meets
at
and meets
again at
. The line through
parallel to
meets line
at
. Denote the circumcircle of triangle
by
. Let
meet
again at
. Prove that the line tangent to
at
meets line
on the internal angle bisector of
.



























This post has been edited 5 times. Last edited by Amir Hossein, Aug 8, 2023, 5:43 PM