Предмет: Алгебра, автор: podniglazova197

Помогите пожалуйста!!!!!!!!!!!!
Sin(30+a) - cos (60+a) sin(30+a) + cos (60+a) =

Ответы

Автор ответа: Эленчик55
0
sin(30-a)-cos(60-a)=sin30*cos(a)-sin(a)*cos30-cos60*cos(a)-sin60*sin(a)=cos(a)/2-√3*sin30/2-cos(a)/2-√3*sin(a)/2=-√3sin(a)/.
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