Sin A= 3/5, cos= 5/13. tentukan tanb(A+B)
sin A = 3/5
sin = depan/miring
sehingga :
depan = 3
miring = 5
samping = 4 (pakai phytagoras)
tan A = depan/samping
tan A = 3/4
sin B = 5/13
depan = 5
miring = 13
samping = 12
tan B = depan/samping
tan B = 5/12
tan A + tan B
tan (A + B) = _____________
1 – tan A tan B
3/4 + 5/12
tan (A + B) = ____________
1 – 3/4 . 5/12
9/12 + 5/12
tan (A + B) = ____________
1 – 15/48
14/12
tan (A + B) = ___________
48/48 – 15/48
14/12
tan (A + B) = ________
33/48
tan (A + B) = 14/12 . 48/33)
tan (A + B) = 56/33