" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
cos b = 4/5 ⇒ sin b = 3/5
sin(a+b) = sina . cosb + cosa . sinb
= 5/13 . 4/5 + 12/13 . 3/5
=
=
=
untuk sudut a, y = 5, r = 13, maka nilai x =√(13²-5²)=√(169-25)=√144=12
dengan demikian cos a = x/r =
untuk sudut b, x = 4, r = 5, maka nilai y =√(5²-4²)=√(25-16)=√9=3
dengan demikian sin b = y/r =
sin(a+b) = sin a cos b + cos a sin b