02.04.2022

Выразить cos2x через cosx и tgx

Вопрос школьника по предмету Алгебра

Ответ учителя по предмету Алгебра

Есть готовые формулы, называются формулы косинуса двойного аргумента. В одной из них cos2x выражен через сosx, в другой через tgx

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