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line of isotomic of incircle touchpoints in equilateral is tangent to incircle

Source: 2012 Oral Moscow Geometry Olympiad grades 8-9 p3

September 8, 2019
geometryisotomicmidpointincircletangent

Problem Statement

Given an equilateral triangle ABCABC and a straight line ā„“\ell, passing through its center. Intersection points of this line with sides ABAB and BCBC are reflected wrt to the midpoints of these sides respectively. Prove that the line passing through the resulting points, touches the inscribed circle triangle ABCABC.