Calculati sinusul ,cosinusul,tangenta :1)120. 2)135. 3)150.

sin120°=sin(90°+30°)=cos30°=√3/2или sin120°=sin(180°-60°)=sin60°=√3/2cos120°=cos(90°+30°)=-sin30°=-1/2tg120°=tg(90°+30°)=-ctg30°=-√32. sin135°=sin(90°+45°)=sin45°=√2/2cos135°=cos(90°+45°)=-sin45°=-√2/2tg135°=tg(90°+45°)=-ctg45°=-1ctg135°=ctg(90°+45°)=-tg45°=-13. sin150°=sin(90°+60°)=sin60°=√3/2cos150°=sin(180°-30°)=sin30°=1/2tg150°=tg(90°+60°)=-ctg60°=-1/√3