Перейти к выбору ответа 04.05.2022(cosa+cos7a)/(sina+sin7a)=ctg4a Выбрать другой вопрос Смотреть ответ Перейти к выбору ответа Алгебра Ответ учителя по предмету Алгебра Распишем по сумме синусов и косинусов: 2*cos(8a/2)*cos(6a/2)/2*sin(8a/2)*cos(6a/2)=ctg4a cos4a*cos3a/sin4a*cos3a=ctg4a сокращаем cos3a cos4a/sin4a=ctg4a ctg4a=ctg4a ч.т.д
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