sin30'=1/2,sin45'=1/√2,sin60'=√3/2,0'=0 90'=1.cos30'=3/√2,cos45'=2/√2cos60'=1/2 0'=190'=0tan30'=1√3,tan45'=1 tan60'=√3,90'=없음(무한) 0'=0
당신은 어느 그룹입니까?