Предмет: Геометрия, автор: KeKs103

привет. дайте четкий ответ зачем учить доказательства к теоремам если знаешь теоремы на отлично.

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Автор ответа: jimmorrison97

Потому что придётся доказывать

Автор ответа: jimmorrison97

ну дак потом в задаче будет потребоваться не решение,а доказательства

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3sin^2(2x)-2=sin2xcos2x
я вообщем разделила на косинус и получила
3tg^2(2x) - tg2x - 2=0
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посмотрела ответ в учебнике, неправильно...
помогите в чём ошибка

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