1) x=225°
sin 225°=sin(180°+45°)=-sin45°=-(√2/2)
cos 225°=cos(180°+45°)=-cos45°=-(√2/2)
tg225°=tg(180°+45°)=tg45°=1
2) x =135°
sin 135°=sin(90°+45°)=cos45°=√2/2
cos 135°=cos(90°+45°)=-sin45°=-(√2/2)
tg 135°=tg(90°+45°)=-ctg45°=-1
3) x = 120°
sin 120°=sin(180°-60°)=sin60°=√3/2
cos 120°=cos(180°-60°)=-cos60°=-(1/2)
tg120°=tg(180°-60°)=-tg60°=-√3