Предмет: Алгебра, автор: parfenovaalena57

sin 3a + sin 7a ÷ cos 3a + cos 7a​

Ответы

Автор ответа: Kristinamykhailyuk14
1

(sin7a+sin3a) дріб (cos7a+cos3a)=2sin5a*coa2a дріб 2cos5a*cos2a=sin5a дріб cos5a=tg5a

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