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MathNet 2017-part-01 — 176 problems (EN–VI) Question 51

Math Olympiad Vault · MathNet 2017-part-01 — 176 problems (EN–VI)

Question 51

Let $ABC$ be an acute triangle and $D$ a variable point on side $AC$. Point $E$ is on $BD$ such that $BE = \frac{BC^2 - CD \cdot CA}{BD}$. As $D$ varies on side $AC$ prove that the circumcircle of $ADE$ passes through a fixed point other than $A$.