sin(a-b)sina.sinb ? cevap cotb-cota
sin(a-b)=sina.cosb-cosa.sinb (sina.cosb-cosa.sinb)/sina.cosb= (sina.cosb)/(sina.sinb)-(cosa.sinb)/(sina.sinb)=?(mesela (2+4)/2=(2/2)+(4/2)) (cosb/sinb)-(cos/sina)=(cotb-cota).