Предмет: Математика, автор: elmis1

найдите сумму корней(в градусах) уравнения   4 cos^2 x:2=1 ,принадлежащих отрезку [-П; 3П:2]

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Автор ответа: DimaPuchkov
0
Решение на фото.
Продолжение решения:
Путём отбора корней через окружность находим корни: -2pi/3, 2pi/3, 4pi/3
-2pi/3+2pi/3+4pi/3=4pi/3=4*180/3=4*60=240 (градусов)
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