Докажите тождество: sima+sin5a/cosa+cos5a=tg3a помогите пожалуйста - №29289766

Докажите тождество: sima+sin5a/cosa+cos5a=tg3a помогите пожалуйста
- Предмет:
  Алгебра
- Автор:
  jayden7ulv
- 6 лет назад

Ответы 1

(sina+sin5a)/(cosa+cos5a)=(sin5a+sina)/(cos5a+cosa)==2*sin((5a+a)/2)*cos((5a-a)/2)/(2*cos(5a+a)/2)*cos(5a-a)/2)==2*sin3a*cos2a/(2*cos3a*aos2a)=sin3a/cos3a≡tg3a.
- Автор:
  willow
- 6 лет назад
- 0
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