Tg 570=? ; ctg960=? ;

Question

Tg 570=? ; ctg960=? ;

Answer 1

Tg570=tg(360°+210°)=tg210°=tg(180°+30°)=tg30°=√3/3
ctg960=ctg(1080-120)=ctg120=-ctg(180-60)=-ctg60=-√3/3