Объяснение:
tg(-45°)*sin(390°)*cos(-60°)=-tg45°*sin(360°+30°)*cos60°=
=-1*sin30°*(1/2)=-(1/2)*(1/2)=-1/4.
Объяснение:
tg(-45°)*sin(390°)*cos(-60°)=-tg45°*sin(360°+30°)*cos60°=
=-1*sin30°*(1/2)=-(1/2)*(1/2)=-1/4.