s(a+b)=s(a)c(b)+c(a)s(b)s(a-b)=s(a)s(b)-c(a)s(b) c(a+b)=c(a)c(b)-s(a)s(b) c(a-b)=c(a)c(b)+s(a)s(b) s=sin c=cos/tan공식까지적기에자리가..!!
당신은 어느 그룹입니까?