Y by
Let
be triangle and point
be
altitude of
.
Let
be a point on
and
such that
and
. Point
is the intersection of
and
. Point
be intersection of
and
. Line
intersect circumcircle of
again at
.
Prove that
(a)
.
(b)
bisect
.




Let














Prove that
(a)

(b)

