olymmath

IR-TST 2018 Problem 18

  • Test 3

Consider quadrilateral ABCDABCD inscribed in circle ω\omega . P≡AC∩BDP\equiv AC\cap BD . EE , FF lie on sides ABAB , CDCD respectively such that APE^=DPF^\hat {APE}=\hat {DPF} . Circles ω1\omega_1 , ω2\omega_2 are tangent to ω\omega at XX , YY respectively and also both tangent to the circumcircle of △PEF\triangle PEF at PP . Prove that: EXEY=FXFY\frac {EX}{EY}=\frac {FX}{FY} Proposed by Ali Zamani

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