Y by
Let
be an inscribed circle of 
and touching
,
,
at
,
,
respectively. Let
and
be diameters of
. Let
and
be the pole of
and
with respect to
, respectively.
cuts
again at
.
cuts
again at
. The tangent at
of
cuts
at
. The tangent at
of
cuts
at
. Let
and
be midpoint of
and
, respectively.
Show that :
,
and perpendicular bisector of
are concurrent.



































Show that :


