Предмет: Алгебра, автор: 2elvira

tg (-a)×cosa+sina=? тригонаметрия

Ответы

Автор ответа: red321

$tg(-a)*cos(a)+sin(a)=-tg(a)*cos(a)+sin(a)=\\=-\frac{sin(a)}{cos(a)}*cos(a)+sin(a)=-sin(a)+sin(a)=0$

2elvira: спасиибо)))

Автор ответа: KaTE3638

tg(-a)=-tg(a)
tg(-a)*cos(a)+sin(a)=-tg(a)*cos(a)+sin(a)=-sin(a)/cos(a)*cos(a)+sin(a)=-sin(a)+sin(a)=0

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