Date: 2017-02-21 09:41 pm (UTC)
From: [identity profile] mi-b.livejournal.com
про логарифмы тангенса, вроде, совсем легкая? Про tg(\pi/2-x) и lg(1/x) ведь проходят в средней школе. В вашей задачке, если догадаться, что середины параллельных хорд лежат на прямой, параллельной оси, тоже дальше просто, но, конечно, ребенок на экзамене может и не догадаться.
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