sin (-1050°)=sin(-3·360°+30°=sin30°=0,5
sin 690°=sin(2·360°-30°)=-sin30°=-0,5
cos 1110°=cos(3·360°+30°)=cos30°=(√3)/2
tg 780°=tg(4·180°+60°)=tg60°=√3
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sin (-1050°)=sin(-3·360°+30°=sin30°=0,5
sin 690°=sin(2·360°-30°)=-sin30°=-0,5
cos 1110°=cos(3·360°+30°)=cos30°=(√3)/2
tg 780°=tg(4·180°+60°)=tg60°=√3