Question

1)Sin330°

2)tg300°

3)ctg(-225°)

4)sin(-150°)

5)tg(-225°)

6)cos120°

Answer 1

c1)Sin330°=sin(360-30)=-sin30=-1/2

2)tg300°=tg(270+30)=-ctg30=-тубир асты(3)

3)ctg(-225°)=-tg(180+45)=-ctg45=-1

4)sin(-150°)=-sin(180-30)=sin30=1/2

5)tg(-225°)=-tg(180+45)=tg45=1

6)cos120°=cos(90+30)=-sin30=-1/2