83 Сумма арктангенсов одной второй и одной третьей from abcd ab Watch Video
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Description: 19.3.2016. Точки E и F делят сторону AB прямоугольника ABCD на три равные части, каждая из которых равна стороне AD. Найдите сумму величин углов AED и AFD.
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