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TR-MO-R1 2017 Problem 3

    Tepe açısı s(A^)=100∘s\left(\hat{A}\right) = 100^\circ olan ABCABC ikizkenar üçgeninde C^\hat{C} açısının açıortayı ABAB kenarını DD noktasında kesiyor. ∣AD∣=x|AD| = x, ∣DC∣=y|DC| = y ise ∣BC∣|BC|'nin xx ve yy cinsinden değeri hangisidir?

    A) x+2yCos⁡40∘x + 2y\operatorname{Cos} 40^\circ B) y+2xCos⁡20∘y + 2x\operatorname{Cos} 20^\circ C) y+2xy + 2x D) 3x−y3x - y E) x+yx + y

    Official text Turkish Mathematical Olympiad, first round 2017 official paper, page 3. Quoted with source.

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