2002 IMO Problems/Problem 2

Problem

$\text{BC is a diameter of a circle center O. A is any point on the circle with } \angle AOC \not\le 60^\circ$

$\text{EF is the chord which is the perpendicular bisector of AO. D is the midpoint of the minor arc AB. The line through}$

$\text{O parallel to AD meets AC at J. Show that J is the incenter of triangle CEF.}$

$\text{By construction, AEOF is a rhombus with } 60^\circ - 120^\circ \text{angles}$

$\text{ Consequently, we may set } s = AO = AE = AF = EO = EF$

$\documentclass{article}

\usepackage[pdftex]{graphicx} \begin{document}

This is my first image.

\includegraphics{myimage.png}

That's a cool picture up above. \end{document}$ (Error compiling LaTeX. Unknown error_msg)