cos238=cos(180+58)=-cos58
sin122=sin(180-58)=sin58
sin58cos77+sin77cos58=sin(77+58)=sin135=sin(90+45)=cos45=sqrt(2)/2
cos238=cos(180+58)=-cos58
sin122=sin(180-58)=sin58
sin58cos77+sin77cos58=sin(77+58)=sin135=sin(90+45)=cos45=sqrt(2)/2