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NL-BXMO-TST 2011 Problem 2

    In an acute triangle ABCABC the angle ∠C\angle C is greater than ∠A\angle A . Let EE be such that AEAE is a diameter of the circumscribed circle Γ\Gamma of \vartriangle ABC. Let KK be the intersection of ACAC and the tangent line at BB to Γ\Gamma . Let LL be the orthogonal projection of KK on AEAE and let DD be the intersection of KLKL and ABAB . Prove that CECE is the bisector of ∠BCD\angle BCD .

    Dataset text AI-MO AoPS. Quoted with source.

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