10 sin120=sin(180-60)=sin60=√3/2
2)cos120=cos(180-60)=-cos60=-0.5
3)tg120=tg9180-60)=-tg60=-√3
4) ctg120=ctg(180-60)=-ctg60=-1/√3
10 sin120=sin(180-60)=sin60=√3/2
2)cos120=cos(180-60)=-cos60=-0.5
3)tg120=tg9180-60)=-tg60=-√3
4) ctg120=ctg(180-60)=-ctg60=-1/√3