[XraZer]

sin(a-b)

sina.sinb

?



cevap cotb-cota

[sinavkizi]

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).