Предмет: Алгебра, автор: Тальони

Помогите пожалуйста, срочно!
1. 7sin^2x=4sin2x-cos^2x
2. -sin5x+sins=2cos3x
3. 2cosx sin3x=sin4x+1
4. sin^2x+sin^2 5x=1
5. cos^-1 x+ctg3x=ctg3x/2
Спасибо заранее!

Тальони: Кто-нибудь может помочь?

Ответы

Автор ответа: dnepr1
1
Есть решение первого примера в приложении.
Приложения:
bd452c86ff4c71a2402b9f0ba51ef071.docx
Тальони: Ну 1 я тоже уже решила,а ты последнее не понимаешь?
Тальони: Мне вот уже только оно осталось
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