tan a = tiga per empat , tan b = delapan per limabelas, a dan b adalah sudut lancip . nilai sin a cos b - cos a sin b

Trigonometri

tan A = 3/4 
tan A = y/x --> x = 4, y = 3 , r = 5 (pitagoras)
sin A = y/r = 3/5
cos A =x/r = 4/5

tan B = 8/15
tan B = y/x --> x = 15, y = 8 , r = 17 (pitagoras)
sin B = y/r = 8/17
cos B = x/r = 15/17

nilai sin A cos B - cos A sin B = (3/5)(15/17) - (4/5)(8/17)
sin A cos B - cos A sin B = 45/85 - 32/85 = 13/85