Advanced Geometric Problem & Solution (Twice a week update) Now 4501 problems posted.
<Tri-2024-2158>, hint
Suppose AP cut the circumcircle of OBPC in D.
Since in triangle ABY, <BAY=90-A <ABY=90, <AYB=<A and <BCP=<BDP=<A
AYBD are cyclic and <ADY=<ABY=90. Similarly <ADX=90
Hence AP ㅗ XY
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