Question

сравните с нулём выражения sin120 °, cos 195° , ctg 359°

Answer 1

sin120°=sin(180°-60°)=sin60°=√3/2 >0
cos195° = cos(180°+15°)=- cos15° <0
ctg 359° = ctg(360°-1°)=ctg1° >0