sin,cos,tan가있고,sin30'는1/2,sin45'는1/√2,sin60'는√3/2이고.cos30'는√2/2,cos45'는cos30'와같고cos60'는1/2이고,tan30'는1√3,tan45'는1이고tan60'는√3
당신은 어느 그룹입니까?