Jawabanmu

2014-09-07T10:24:26+07:00
Sin 30 = 1/2 cos 30 = 1/2 (akar 3) sin dan cos 45 = 1/2 (akar 2) sin 60 = 1/2 (akar 3) cos 60 = 1/2 sin 90 = 1 cos 90 = 0