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NL-NWO 2019 Problem 3

    Points A,BA, B , and CC lie on a circle with centre MM . The reflection of point MM in the line ABAB lies inside triangle ABCABC and is the intersection of the angle bisectors of angles AA and BB . Line AMAM intersects the circle again in point DD . Show that ∣CA∣⋅∣CD∣=∣AB∣⋅∣AM∣|CA| \cdot |CD| = |AB| \cdot |AM| .

    Dataset text AI-MO AoPS. Quoted with source.

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