Y by v4913, CyclicISLscelesTrapezoid, CT17, OronSH, mathmax12, mahaler, ETS1331, Danielzh, HWenslawski, Amir Hossein, ItsBesi
We are given an acute triangle
. Let
be the point on its circumcircle such that
is a diameter. Suppose that points
and
lie on segments
and
, respectively, and that
and
are tangent to circle
.
Show that line
passes through the orthocenter of triangle
.










Show that line

