Предмет: Алгебра, автор: LSM54

ПОМОГИТЕ!! Тригонометрия! 100 БАЛЛОВ!!

Приложения:

GoldenLady89: завдання довести?

GoldenLady89: в мене є готово на фото, але не можу запостити

Ответы

Автор ответа: wqwwqwqvhjv

1

Решение

1)-сos(2φ)(-cos(3φ))=-sin(2Ф)sin(3Ф)-(-cos(Ф))

2)cos(2φ)cos(3φ)=--sin(2Ф)sin(3Ф)+cos(Ф)

3)cos(2φ)cos(3φ)+sin(2Ф)sin(3Ф)-cos(Ф)=0

4)cos(-Ф)-cos(Ф)=0

5)cos(Ф)-cos(Ф)=0

6)0=0

Ответ

Ф∈R

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