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Консультация № 194756
21.02.2019, 14:16
0.00 руб.
0
2
2
Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
(cos(5x)/cos(x))(-1-sin^2(x)*cos(2x)+2cos^2(x))=1
(cos(5x)/cos(x))(-1-sin^2(x)*cos(2x)+2cos^2(x))=1
Обсуждение
21.02.2019, 15:05
общий
это ответ
Здравствуйте, alina.poroshina124564!
ОДЗ:
Сумма четырех косинусов равна 4 только в том случае, если каждый из них равен 1 одновременно:
, 
,
, 
Ответ:
,
ОДЗ:
Сумма четырех косинусов равна 4 только в том случае, если каждый из них равен 1 одновременно:
, , , Ответ:
,
Тогда 
Подстановка в последнее выражение подтверждает, что это так. График в прикреплённом файле -- тоже.
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