dik Cos A 3/5 dan sin B 12/13 A B sudut lancip maka nila Sin A-B adalah

cosA = 3/5
sinA = 4/5

sinB = 12/13
cosB = 5/13

sin(A-B) = sinA cosB + cosA sinB
sin(A-B) = (4/5) (5/13) + (3/5) (12/13) = (20/65) + (36/65) = 56 / 65