Let two circle 
and a point 
on the plane. 
are tangent of to 
, 
are tangent of to 
. 
is common tangent of 
.
meet 
at 
; 
meets at 
, 
meets at 
; meets 
at 
.
Prove that:
- 
are collinear-
are collinear
http://www.cut-the-knot.org/m/Geometry/TwoCollinearities.shtml
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