Dik: tanA=3/4 tanB=8/15 Dit: sinA cosB-cosA sinB

A
Y = 3
X = 4
r = 5 (pitagoras

B
Y = 8
X = 15
r = 17 (pitagoras

SinA cos B - cosA sin B
3/5 x 15/17 - 4/5 x 8/17
45/85 - 32/85
13/85

sin a=3/5
cos b=15/17
cos a= 4/5
sin b=8/17

45/85-32/85
13/85