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BALKAN-SL 2015 G7

    Let scalene triangle ABCABC have orthocentre HH and circumcircle Γ\Gamma . AHAH meets Γ\Gamma at DD distinct from AA . BHBH and CHCH meet CACA and ABAB at EE and FF respectively, and EFEF meets BCBC at PP . The tangents to Γ\Gamma at BB and CC meet at TT . Show that APAP and DTDT are concurrent on the circumcircle of AFEAFE .

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