[질문] sin75°가얼마죠?

sin75˚=sin(45˚+30˚)=sin45˚cos30˚+cos45˚sin30˚ =(1/√2)(√3/2)+(1/√2)(1/2) =√6/4+√2/4 =(√6+√2)/4=cos15˚ 입니다 약 0.9659