sin a = 3/5 sin b = 12/13 maka tan (a-b)=

sin a = depan/miring = 3/5
cari samping pake phytagoras

samping² = 5²-3²
samping² = 25-9
samping² = 16
samping = √16
samping = 4

tan a = depan/samping = 3/4

sin b = 12/13

cari samping =

samping² = 13²-12²
samping² = 169-144
samping² = 25
samping = √25
samping = 5

tan b = 12/5

tan (a-b) = tan a-tan b = 3/4-12/5 = ....