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How do you prove that the orthocenter and the circumcenter of any triangle are isogonal conjugates?

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In March of 2003, a mystic crowbar appeared in Edge magazine, signifying that a long-awaited sequel to Half-Life was approaching. Munro formed this site almost immediately, as a place for people to share every snippet of information available about the upcoming sequel, as well as discuss it with other fans of the series.

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