Вычислите :cos210°+sin120°-tg240°

Question

Вычислите :cos210°+sin120°-tg240°

Answer 1

Cos(210)=cos(180+30)=-cos(30)= -√3/2
sin(120)=sin(90+30)=cos(30)=√3/2
tg(240)=tg(180+60)=tg(60)=√3
 -√3/2+√3/2-√3= -√3