Sin120°=sin(90°+30°)=cos30°=√3/2
или sin120°=sin(180°-60°)=sin60°=√3/2
cos120°=cos(90°+30°)=-sin30°=-1/2
tg120°=tg(90°+30°)=-ctg30°=-√3
2. sin135°=sin(90°+45°)=sin45°=√2/2
cos135°=cos(90°+45°)=-sin45°=-√2/2
tg135°=tg(90°+45°)=-ctg45°=-1
ctg135°=ctg(90°+45°)=-tg45°=-1
3. sin150°=sin(90°+60°)=sin60°=√3/2
cos150°=sin(180°-30°)=sin30°=1/2
tg150°=tg(90°+60°)=-ctg60°=-1/√3